Same problem here. I updated the drivers because of issues with certain games and now the UI in Limewire is messed.

My hardware setup is similar. 7800GTXs in SLI, AMD 4000+ proc, 1GB RAM, Windows XP Pro SP2 and latest NVidia graphics and NF4 drivers.

Here's a link to a screenshot:
http://www.ualberta.ca/~mturgeon/limemessed.JPG

And, yes there were downloads going on at the time of the screenshot!