Hi this thing comes as a commn problem because of a TROJAN Method 1 Click Start, Run and type this command exactly as given below: (better - Copy and paste) REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f Method 2 Click Start, Run and type Regedit.exe Navigate to the following branch: HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System In the right-pane, delete the value named DisableTaskMgr Close Regedit.exe Method 3 Using Group Policy Editor - for Windows XP Professional 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.
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