There is a registry edit to enable the Task Manager. The same step applies to Windows 2000 and Windows XP.
Value: 1=Enablethis key, that is DISABLE TaskManager
Value: 0=Disablethis key, that is Don't Disable, Enable TaskManager
The TaskManager can also be enabled using Group Policy Editor (only available in XP Pro/Vista Pro and up and if you're logged in as administrator).
1. Click Start
2. Click Run
3. Enter gpedit.msc in the Open box and click OK