Thursday, September 5, 2013

Computer Problems & Solutions

 can't see Hidden files/folders in my computer. Even I enable the option "Show hidden files/folders" in "Tools -> Folder Options", its automatically disabled again.

Solution1: Go to your Start menu, click on Run and open up your Registry Editor by typing "regedit" without the quotes and pressing OK.

Once there go to: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folde r\Hidden\SHOWALL

Delete the value CheckedValue. (Its type should be REG_SZ and data should be 0 or 1.)

Create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD) by right clicking on the right pane->New->DWORD Value. Modify the value data to 1 (0x00000001).
Solution 2: Open regedit and goto:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
In right-side pane, change value of "Hidden" to as following:

1 - To show hidden file
2 - To not show hidden files

If it doesn't work, then scan your computer with an anti-virus software.


Task Manager Disabled:

Using Group Policy Editor - for Windows XP Professional to Enable Task Manager.

* Click Start, Run, type gpedit.msc and click OK.
* Navigate to this branch:

User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task Manager

* Double-click the Remove Task Manager option.
* Set the policy to Not Configured.

Enable RegEdit [It is not tested]

REGEDIT4
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersio
n\Policies\System]
"DisableRegistryTools"=dword:00000000

Save the text file as any name u with extension .reg
example:- "enable.reg"
After that double click to run the file.

Note:DO SCAN YOUR MACHINE WITH A GOOD ANTIVIRUS. BECAUSE THIS PROGRAMS DON'T TURNED OFF BY HIMSELF OR AUTOMATICALLY. IT HAS TO A VIRUS EFFECT OR A ADMINISTRATOR HAS TO MANUALLY DISABLE THIS PROGRAMS.


Restore Deleted Recycle Bin Icon from Desktop:

Method #1:
1. Right-click an empty area of your desktop
2. Select Properties
3. Click the Desktop tab
4. Click the Customize button
5. Click Restore Default
6. Exit all windows and restart your computer

Method #2:
Note: Be sure to make a backup copy of your registry prior to making any changes.

Go to Start>> Run. Type in: regedit [Enter]

Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace

Hold the mouse on NameSpace and right-click once. From the resulting menu, select Edit>> New>> Key

Copy and Paste the following Key code (including the brackets):

{645FF040-5081-101B-9F08-00AA002F954E}

Press Enter on your keyboard, exit the registry editor and restart your system.



Blank User Accounts Applet :

Problem:
When you double-click User Accounts applet in the Control Panel, the User Accounts applet opens, but it may be completely blank.

The buttons Back | Forward | Home are displayed in the dialog.

Resolution:
To resolve the problem, type these commands from Start, Run dialog:

regsvr32 jscript.dll

If that does not help, execute the following commands as well.

regsvr32 nusrmgr.cpl
regsvr32 /i mshtml.dll


Force windows XP to reboot upon crashing:

This registry edit will cause your system to reboot itself automatically upon crashing. This can be useful if you have a reason for keeping your system on 24/7:


Open REGEDIT

Navigate to 'HKEY_LOCAL_MACHINE\SYSTEM
\CurrentControlSet\Control\CrashControl'

Edit the 'AutoReboot' value to '1'


Stand By Icon Disabled:

Problem:
I reinstalled my windows and now "Stand By" option is Grey out in shutdown dialog box and I can't use it.

Sol: Install VGA drivers from your motherboard CD and the option will be enabled. If you don't have the motherboard CD, then go to the manufacturer site and download the required drivers.

Improving the Slow Boot up time:

There are a variety of reasons why your windows XP system would boot slowly. Most of the times it this has to do with the startup applications. If you would like to speed up the bootup sequence, consider removing some of the startup applications that you do not need. Easiest way to remove startup apps is through System Configuration Utility. Go to Start then Run and enter MSCONFIG and go to the Startup tab. Deselect/UnCheck application(s) that you do not want to startup at boot time.

Regedit Disabled By Admin:

Open Notepad pad, copy paste the following text to the note pad::

REGEDIT4
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersio
n\Policies\System]
"DisableRegistryTools"=dword:00000000

Save the text file as any name u with extension .reg

example:- "enable.reg"

After that double click to run the file.

Task Manager Disabled:

If you are working on Windows XP pro, following steps will help u to enable Task Manager

SOLUTION 1:
Click Start --> Run
Enter gpedit.msc in the Open box and click OK
In the Group Policy settings window, select User Configuration
Select Administrative Templates
Select System
Select Ctrl+Alt+Delete options
Select Remove Task Manager
Double-click the Remove Task Manager option
Disable that option

SOLUTION 2:
Click on Start >> Run and in the Open box type:

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f

Click OK.


2. Double-clicking any drive opens search option:

Solution 1:
That's a virus named as ravmon.exe and autorun.inf
Scan first with a good antivirus [Nod32 Recommanded]
then try this trick.

First show the hidden files and folders options then try this method

1. Go to Start-->run and type cmd then click ok

2. If u want to remove the infected file from c drive then type C: in command prompt and press enter

3. Type autorun.inf and press enter
autorun.inf file is opened

4. Now type "attrib autorun.inf -s -h -r" and press enter

5. Now delete the file by typing
"del autorun.inf" and press enter

6.Now type autorun.inf and press enter now, u will find no infected autorun.inf file.

7. same way do for all other drives then restart ur pc


I accidentally deleted my "mspaint.exe"/"notepad.exe"/etc. file, how can I get it back?


Solution::

You can use any of following methods:

A. Goto "%windir%\System32\DLLCache" folder and look for the file, if its there then copy it to "%windir%\System32\" folder.

B. Insert your Windows Setup CD and goto "I386" folder. Now look for the same file, it'll present there but the last letter of extension will be "_". e.g., u'll get "mspaint.ex_"/"notepad.ex_"/etc. Now open Command Prompt and goto "I386" folder and give following command:

expand mspaint.ex_ mspaint.exe
expand notepad.ex_ notepad.exe
etc.

Now u can copy the file to "%windir%\System32" folder.

C. Give following command in Command Prompt:

sfc /SCANNOW

It'll automatically restore the files.

When I right-click on Start button and select "Open", a "Copy To" or "Move To" dialog box opens automatically.

Solution:
Open regedit and goto:
Code:
HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers\

Now under this key, delete following 2 keys:
Copy To
Move To


Windows is showing some wrong icons of files. How can I reset the corrupted icons?

Solution:

You can use any of following methods:

A. Download TweakUI and then click on "Repair Icons" in "Repair" section.

B. Open My Computer and goto:
C:\Documents and Settings\User_Name\Local Settings\Application Data

Replace C:\ with your system drive and "user_Name" with your username.
Now there'll be a HIDDEN file "iconcache.db", delete it and restart your system.


A strange process "ctfmon.exe" always runs in background and if I click on "End Process" button, it restarts automatically.

Solution:
Open Control Panel and goto Add/Remove Programs list. Now click on the Microsoft Office entry and then click on "Change" button. Now select "Add/Remove Features" and click on "Next". Now expand "Office Shared Features" and click on "Alternative User Input" and then select "Not Available" and finally click on Update. It'll permanently remove that ctfmon.exe and your problem will be solved.

My Windows Login Screen has changed to "Classic Logon Box". I want the new Welcome Screen back.

Solution:
Type "control userpasswords" in RUN dialog box or Open "User Accounts" in Control Panel. Then click on "Change the way Users log on and off". Now check the option "Use Welcome Screen". If you get following error:

Uninstall client services for netware.

Then Open "Network Connections" and open Properties of your Internet Connection. Now goto "Networking" tab and select "Client services on Netware" option and click on the"Uninstall" button.


Whenever I start my computer, Scandisk starts running even I proper shut down the PC last time.

Solution:
Do as following:

A. Open regedit and goto:

Code:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

In right-side pane, change the value of BootExecute to:

autocheck autochk *

B. If the above trick doesnt help then give following commands in Command Prompt:

chkntfs /x drive_name

for e.g., if ScanDisk runs automatically for C: and D: drives, then give following commands one by one:

chkntfs /x C:
chkntfs /x D:


When I start my computer, I get error message:

"Windows\System32\config\system" file missing or corrupt

Solution::
Boot using Windows Setup CD and enter into "Recovery Console" by pressing "R". Now Log into windows installation and enter admin password. Now give following commands at prompt:

copy %windir%\Repair\system %windir%\System32\Config

If it doesnt work, then again boot into "Recovery Console" and give following commands:

fixmbr
bootcfg /scan
bootcfg /rebuild
fixboot


Win XP Tweaks

STARTUP

Networking based Interview Questions

1. What is an IP address?
2. What is a subnet mask?
3. What is ARP?
4. What is ARP Cache Poisoning?
5. What is the ANDing process?
6. What is a default gateway? What happens if I don't have one?
7. Can a workstation computer be configured to browse the
8. Internet and yet NOT have a default gateway?
9. What is a subnet?
10. What is APIPA?
11. What is an RFC? Name a few if possible (not necessarily the
12. numbers, just the ideas behind them)
13. What is RFC 1918?
14. What is CIDR?
15. You have the following Network ID: 192.115.103.64/27. What is the IP range for your network?
16. You have the following Network ID: 131.112.0.0. You need at least 500 hosts per network. How many networks can you create? What subnet mask will you use?
17. You need to view at network traffic. What will you use? Name a few tools.
18. How do I know the path that a packet takes to the destination?
19. What does the ping 192.168.0.1 -l 1000 -n 100 command do?
20. What is DHCP? What are the benefits and drawbacks of using it?
21. Describe the steps taken by the client and DHCP server in order to obtain an IP address.
22. What is the DHCPNACK and when do I get one? Name 2 scenarios.
23. What ports are used by DHCP and the DHCP clients?
24. Describe the process of installing a DHCP server in an AD infrastructure.
25. What is DHCPINFORM?
26. Describe the integration between DHCP and DNS.
27. What options in DHCP do you regularly use for an MS network?
28. What are User Classes and Vendor Classes in DHCP?
29. How do I configure a client machine to use a specific User Class?
30. What is the BOOTP protocol used for, where might you find it in Windows network infrastructure?
31. DNS zones – describe the differences between the 4 types.
32. DNS record types – describe the most important ones.
33. Describe the process of working with an external domain name.
34. Describe the importance of DNS to AD.
35. Describe a few methods of finding an MX record for a remote domain on the Internet.
36. What does "Disable Recursion" in DNS mean?
37. What could cause the Forwarders and Root Hints to be grayed out?
38. What is a "Single Label domain name" and what sort of issues can it cause?
39. What is the "in-addr.arpa" zone used for?
40. What are the requirements from DNS to support AD?
41. How do you manually create SRV records in DNS?
42. Name 3 benefits of using AD-integrated zones.
43. What are the benefits of using Windows 2003 DNS when using AD-integrated zones?
44. You installed a new AD domain and the new (and first) DC has not registered its SRV records in DNS. Name a few possible causes.
45. What are the benefits and scenarios of using Stub zones?
46. What are the benefits and scenarios of using Conditional Forwarding?
47. What are the differences between Windows Clustering, Network Load Balancing and Round Robin, and scenarios for each use?
48. How do I work with the Host name cache on a client computer?
49. How do I clear the DNS cache on the DNS server?
50. What is the 224.0.1.24 address used for?
51. What is WINS and when do we use it?
52. Can you have a Microsoft-based network without any WINS server on it? What are the "considerations" regarding not using WINS?
53. Describe the differences between WINS push and pull replications.
54. What is the difference between tombstoning a WINS record and simply deleting it?
55. Name the NetBIOS names you might expect from a Windows 2003 DC that is registered in WINS.
56. Describe the role of the routing table on a host and on a router.
57. What are routing protocols? Why do we need them? Name a few.
58. What are router interfaces? What types can they be?
59. In Windows 2003 routing, what are the interface filters?
60. What is NAT?
61. What is the real difference between NAT and PAT?
62. How do you configure NAT on Windows 2003?
63. How do you allow inbound traffic for specific hosts on Windows 2003 NAT?
64. What is VPN? What types of VPN does Windows 2000 and beyond work with natively?
65. What is IAS? In what scenarios do we use it?
66. What's the difference between Mixed mode and Native mode in AD when dealing with RRAS?
67. What is the "RAS and IAS" group in AD?
68. What are Conditions and Profile in RRAS Policies?
69. What types or authentication can a Windows 2003 based RRAS work with?
70. How does SSL work?
71. How does IPSec work?
72. How do I deploy IPSec for a large number of computers?
73. What types of authentication can IPSec use?
74. What is PFS (Perfect Forward Secrecy) in IPSec?
75. How do I monitor IPSec?
76. Looking at IPSec-encrypted traffic with a sniffer. What packet
types do I see?
77. What can you do with NETSH?
78. How do I look at the open ports on my machine?