Task manager is very much useful for ending the process which are not responding,programs which takes high memory and very much useful for identifying the virus.So most of the virus programmers will prefer to disable virus.I am going to explain you how to disable taskmanger and how to enable the task manager.
There are actually many ways to disable taskmanager.The ways are using
1)Group Policy
2)Registry editing
1) Disabling task manager using Group Policy:
Steps to disable is
1)Click Start and click Run
2)Type gpedit.msc in run
3)Under user configuration