This could be caused by a virus, but before you panic, it could also be missing if, for some unknown reason, Task Manager did not install or was deleted. So, first you should find out if it's there:
Start / Search "all files & folders" for " taskmgr.exe ". This file should be located on your C drive in the Windows / System32 folder.
If not, then all you need to do is restore it from your XP installation disk (now where did I put that thing??)
Found it yet? Good. Put the Windows XP CD into your CD-ROM. If you have Autoplay enabled, the Welcome screen will come up—you can just close out of it.
Click Start / Run then type " cmd " to get a System 32 command prompt then...
Type in the drive letter of your CD-ROM followed by a colon and hit Enter (for example... D: )
At the D: prompt type in "cd \i386" then Enter
Now type in "expand taskmgr.ex_ %SystemRoot%\SYSTEM32\taskmgr.exe" making sure that you put a space between "ex_" and "%System..."
Then press Enter . The file should extract and install into the proper folder.
Don't believe me? Try Control+Alt+Delete and see if Task Manager comes up.
There you go. Hurray! The Task Manager has returned.
source : worldstart.com
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