Very well could be the reason..I'm not a Vista user, so I really don't know alot about the system...
I reckon post what you have just said over at the limewire.org forums...A couple of the developers frequent there..They may know what's going on....
Bugs and Beta Testing - LimeWire Forums

Sorry I can't help more..

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If you dont live for something...
You die for nothing...

alright I tried the peer gaurdian and the hostil list and nothing worked.

well thank's for trying.