Umpiredice:- I'm no windows expert, but I think you are really in need of an upgrade or two
The 450 MB on your one drive which I assume houses your OS is not enough (well on a mac it certainly is not enough) 125 RAM is pretty dodgy too! and also Limwewire version 4.9.30 was hailed as the first limewire to suck even more out of your computer, particularly windows. I am hoping you still have the 4.8.1 installer on your machine. I think going back to that will solve yopur problems. Let me know if this helps. 4.8.1 should be available on Limewire, if you can get it! Dissabling ultrapeer capabilities might still help a bit, as I get the impression that attempts to connect in vain as an ultraper might use up some resourses.