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