When your Task Manager is disabled, maybe it is set ny administrator or infected by virus.

When your pc is infected by virus, one way to stop the process is in the task manager. But the problem is, when the virus is disabled it.

Heres one way to enable it...
1. Hit the "Start" Button
2.In "run" type the gpedit.msc

Enabling TAsk Manager
step 3: when gpedit.msc appears, click on administrative templates
step 4: click on system, then CTRL + ALT + DEL options
step 5: then double click on remove task manager
step 6: then enabled it then click apply, then click disabled then ok
try to run the task manager... HAve Fun!!!
Note: gpedit.msc is not available on windows home edition