It says task manager has been disabled by administration..
Try this:
If Task Manager has been disabled, you can re-enable it
if you have administrator privileges on the computer.
To enable Task
Manager on a computer running Windows Vista
Home Basic or Windows Vista Home
Premium
This procedure requires you to edit the
registry. An incorrect change to your computer's registry could render
your computer inoperable. We strongly recommend that you back up the
registry before making any changes. For more information, see Back up the
registry.
To
enable task Manager on a computer running other editions of Windows Vista
, typing regedit into the Search box, and then pressing
ENTER.
If you
are prompted for an administrator password or confirmation, type the
password or provide confirmation.
or you're computer might be infected by a virus, if you're not the one who disabled the task manager.
Try to scan your computer also.
SOURCE: task manager
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SOURCE: Task Manager is disabled by Administrator
1. Verity that the "Local Group Policy" or "Domain Group Policy" doesn’t block you from using
"Task Manager".
1.1 "Local Group Policy"
a. Go to "Start" -> "Run" -> Write "Gpedit.msc" and press on "Enter" button.
b. Navigate to "User Configuration" -> "Administrative Templates" -> "System" -> "Ctrl+Alt+Del Options"
c. In the right side of the screen verity that "Remove Task Manager"" option set to "Disable" or "Not Configured".If it is set 2 not configured try changing it 2 disabled.
d. Close "Gpedit.msc" MMC.
e. Go to "Start" -> "Run" -> Write "gpupdate /force" and press on "Enter" button.
Note: If you are using Windows 2000, please follow KB q227302 instead stage "e".
Using SECEDIT to Force a Group Policy Refresh Immediately
http://support.microsoft.com/kb/q227302/
1.2 "Domain Group Policy"
a. Contact you local IT support team.
2. Verity correct registry settings::
a. Go to "Start" -> "Run" -> Write "regedit" and press on "Enter" button.
Warning: Modifying your registry can cause serious problems that may require you to reinstall your operating system.
Always backup your files before doing this registry hack.
b. Navigate to the following registry keys and verity that following settings set to default:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]
"DisableTaskMgr"=dword:00000000
[HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionGroup Policy ObjectsLocalUserSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]
"DisableTaskMgr"=dword:00000000
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionpoliciessystem]
"DisableTaskMgr"=dword:00000000
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogon]
"DisableCAD"=dword:00000000
c. Reboot the computer.
SOURCE: disabled task manager
Read this
http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html
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