I was having the same trouble, I wrote limewire for help and they told to uninstall limewire and java and installed them back again but it did not work, I had notice though that I was not able to enter the task manager either.

Follow everything so far and I found the windupdates.exe file in the task manager consuming 98% of my cpu, in the registry and in the prefetch folder.

I'm hoping I did it right because now I'm going to install limerwire again.

Thanks for the help.