As I posted in the nederlands section before deleting, see LimeWire continually Popping up & also Opening at System Startup (click on link)
I would recommend getting Norbie to help solve the issue. Just register at his site & follow his instructions carefully & he will help solve the issue; NorbiesWorld (click on link)

To suddenly behave in the manner suggested suggests something is extremely wrong. If I'm wrong & it's not a virus at fault, then it is most likely either Java version of preferences are corrupt. You could follow steps here Fixes for Limewire If you change compatibility mode, try either win 2k or NT.