That's usually caused by a virus.

Try the fix here: To fix the limewire keeps popping up / no taskmanager bug do the following

If you still need help. Go to Norbie's World! for free computer help.

More info on viruses here: WARNING: Viruses on network you should be aware of!

Another good thread: Anti-virus protection and so on

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If it ain't broke, fix it till it is!