8800 GT Help

i have a 8800gt with the latest driver 196.21 installed. I was deleting some files from add/remove last night plus i ran a disk cleanup before that to free up some hard drive space. after all that was done everything was working properly. today i turned my pc and noticed that the graphics changed. In device manager my 8800Gt has the exclamation sign beside it but i have no idea whats the problem. I removed the driver, rebooted and reinstalled the 196.21 driver and everything is the same. when i double click the nvidia control panel i get this message:

Nvidia display settings are not available. You are not currently using a display attached to an nvidia gbu.
I checked the general properties for the card and it has a code 37 error saying windows cannot initialize the device driver for the hardware. When i click the check solutions nothing occurs.

Any idea what could have caused this and what i should do to fix it.

Thank you