Help with video driver and windows update please = (?

my comp had to be wiped recently because it had a virus, and now the video card driver and sound isnt working. ive been going crazy for weeks now trying to figure out how to get secondlife to run again. for some reason, the windows update isnt working. and i cant locate what the manufacture is for the video driver. can anyone help me please???|||another good software is Driver Robot, it scans your computer and finds the nessecary drivers