Lagging Screen Savers With SLI

I have 2 XFX 7600 Gt's and I had to reinstall W7 and now whenever I enable SLI my screen savers become choppy ... no matter what settings I use ... I have checked my graphics settings, my resolution, and my refresh rate. It all seems good. Any ideas?

FIXED ... ran driver update service for my 7600 gt's and installed new software that fixed it