Your pc may not be fast enough even mine do's it what it's trying to do is compile ever thing all at once and it just take's a little bit longer that's all
Or try to do a defrag on your drive or drive's if you have two.Or a nother reason is you dont have enough Ram you need at lest 1GB now a days to have a fast computer.i have 768 witch is a 256chip and a 512chip that's =768mb of ram witch is more than enough for your pc.But if i am wrong that you both have more than that then that's good.You all so might have a lot of bad problems that you dont no about yet.I would try this.System Machanic 7 Professional it's about 50$ at walmart but here is a link from download.com it's a 30 day trail.
System Mechanic Professional - Reviews and free System Mechanic Professional downloads at Download.com

Chris B.......

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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