Hi, I had the same problem, all working fine, ran windows update, installed .net v2, did some spyware removal and something broke somewhere.... I tried reinstalling limewire, rebooting etc.. etc.. but was still bust, was just hanging on the initial splashscreen.

Anyway, I fixed it by uninstalling java from control panel and reinstalling from http://java.com/en/download/index.jsp

.NET v2 knackering java installs by any chance ?? now THATS one for the conspiricy theorists to get excited about :-)

Hope this helps someone else,

Rob