You have to take into COnsideration what Version of vista they are Using because just like XP, XP home and PRO were 2 different OS's regardless because of certain key features.

Same that goes with Vista now there are like 6 Versions of Vista.

this version of Vista might run this program but this version might not.

Now My GPU is an ATI X1800XT PCI-E

now several of my XP systems work completly fine with the new and beta Versions(but thats XP).

I know it has to be something with Limewire because a Previous Version I used worked completly fine, But it was a Version that was not supported by Vista, I no longer have that .exe file due to several formats and the fact that the site only host's the newest release and Beta.

If i could find out what version it was i would go back to that Pre-Vista Version release that actualy worked.

It is possible too that some windows updates might have broken something in Your Program but thats something limewire will have to find if so.

or maybe something with the newest Java.