Video adapter problem

Alright, I'm having a bit of a problem. I recently started up my computer and realized that my resolution was lower then it should be. I looked in my device manager and for some reason my video cards (I'm running two Geforce 7900 GS's in SLI) have an error that says " This device cannot start. (Code 10) " I've tried uninstalling and reinstalling drivers, switching the cards around, checking for errors on the hard disk, and a few other things. I can't seem to figure this one out.. I would greatly appreciate any help that could be given. Thank you in advance. ^^