If you have Windows XP Professional then do one thing:
1. Click Start - Run - type GPEDIT.MSC and press enter
2. Expand To:
User Configuration
Administrative Templates
System
Ctrl+Alt+Del Option
3. Look in the right side pane. Set all 4 options in the right side pane to
"Disable" if they are already configured to "Not Configured" or "Enable"
If that doesn't help then or you have Windows XP Home Edition
1. Click Start - Run - type REGEDIT and press enter
2. Expand To:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System.
In the right-side pane, check if the value exists like:
DisbaleChangePassword
DisbaleLockWorkstation
DisableTaskMgr
Delete all those entries.
Check if you can open Task Manager now or Restart your computer once.
Meanwhile check the following link and see if this helps you:
http://support.microsoft.com/kb/555480
Let us know, if any of works.
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Tip of The Day
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How about a "Single Key" as a shortcut? No combination like CTRL, ALT, and
SHIFT required.
Use your Num Pad keys while defining a shortcut.
