If your Lime wire will not shut down or keep opening buy it self than you got your self a worm and the only way to get rid of it is with AVG.
Here is a link.
AVG Anti-Spyware - Reviews and free AVG Anti-Spyware downloads at Download.com

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Fixes For Limewire When LW Isn't Operating As It Should
If you've updated LW and can't find your downloads!
LimeWire FAQ and User Guide--If LimeWire Will Not Load
If Limewire Will Not Connect

System Mechanic--FileHippo--Download.com

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Some time's i just want to throw my computer out the window