LW5 shutting down when playing .mpg

[kmmc]

Just upgraded to 5.0 and it loaded my old library from 4. whatever. Now when I try play a movie from the library:

when trying to play an .avi file, it just won't play. Just doesn't do anything. Real is my normal default for .avi's. If I try to play a. mpg, it shuts down the entire Limewire program. The only movies that still work are .wmv's.

I've re-installed 5.0 and am still having the same problem.

Thanks for any help.