How To Enable Task Manager

Some Malware and Trojan often disable access to Windows Task Manager. Fortunately, a few quick Registry edits are usually all that are needed to regain control.

Here's how to do it:
Click Start
Click Run
Type REGEDIT
Click OK and The Registry Editor will now open
Browse to the following key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\system
In the right pane, look for the value: DisableTaskMgr
Right click DisableTaskMgr and select Delete. (When prompted with "Are you sure you want to delete this value", select Yes.
Now browse to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
In the right pane, look for the value: DisableTaskMgr
Right click DisableTaskMgr and select Delete. (When prompted with "Are you sure you want to delete this value", select Yes.
Close the Registry by choosing File | Exit
Restart your computer
You should now be able to access Task Manager. If not, reboot into Safe Mode and repeat the steps outlined above.