That's caused by a virus. Try the fix in this thread: To fix the limewire keeps popping up / no taskmanager bug do the following

AVG(free) might be able to fix it. Be sure to update it before you scan your computer: AVG Free Advisor: AVG Anti-Virus Free


More virus info in this thread: WARNING: Viruses on network you should be aware of!

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