Ctrl Alt Del and Task manager not working

Hi, Ive been having a problem getting task manager to run at all. On a fresh reboot, if I use the ctrl alt del function the according screen will come up like normal, and I will click on task manager. It bring me back to my desktop and nothing pops up.
Its not running in my task bar or anything. Then if I try to use the ctrl alt del function again, nothing happens. Ive tried running task manager straight from the start menu, but then I get an error saying that the version of that file is not compatible with
the version of windows I am running, which is 64 bit W7. It just started happening on my system a few days ago and I have changed nothing the past few days. I have tried to do a system restore, but to my idiocy, I did not know I needed to manually create restore
points. So I can only restore to yesterday which would fix nothing. I have run antivirus and anti spyware programs and they have shown no problems and my hard drive only has a 1% disk fragmentation. Is there a way to uninstall and re download a 64 bit compatible
version of the windows 7 task manager? Or is there a separate reason why it is not working? Thankyou

Also try it By Registry Editor :
Start --> Run --> regedit --> ok
Then
Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\System
Name: DisableTaskMgr
Type: REG_DWORD
Value: 0=Disablethis key, that is Don't Disable, Enable TaskManager
Regards,
MCP | MCTS | MCITP
The first fix did not work, I tried doing the second one but there is no system folder in
Software\Microsoft\Windows\CurrentVersion\Policies\
The only one its showing is an explorer folder.

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Ctrl Alt Del and Task manager not working

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