This sounds like it could be a virus, but there are a lot of them that disable task manager. Are there any error messages when Ctrl Alt Del are pressed?
If you look in the
C:\WINDOWS\system32 directory, check to see if
taskman and
taskmgr file are there. Try opening taskmgr as well. What exactly happens? Any error messages?
If task manager still isn't running from here, try looking at these sites
http://www.windowsnetworking.com/kbase/Win...indows2000.html
http://www.infopackets.com/gazette/2003/20...2000_and_xp.htm
These sites above have some settings you can change to enable task manager.
This site,
http://www.dougknox.com/xp/utils/xp_taskmgrenab.htm has a exe file which i tried and it worked perfectly. It allows you to disable or enable task manager.