32bit Programs Not Starting On Windows 7 64?

im currently working on an assignment for university, so the faster I can come to a fix for this the better!I restarted my pc earlier, after I noticed the audio was slightly laggy, the same sort of lag one would get if they had a very high CPU utilisation and I've experienced it in the past when doing some 3d rendering, nothing horrible, just slightly echoy almost, you wouldnt really even notice it.Upon restarting I noticed there was a lack of programs starting, my antivirus didn't seem to load, and neither did firefox, steam, irc - i thought I must have a virus, and then none of my programs that I would normally scan for malware would open - antimalwarebytes, adaware etcI did however notice that ventrilo would open and a few other selective programs, it appears that only 64bit programs are opening, I googled this and came accross a thread on these very forums, stating something about xonar soundcard drivers causing this - I do have an asus xonar d2, and it seemed to point towards this being the problem, I uninstalled the drivers, but the problem is persisting.I have already tried a system restore twice to no avail, ive had this install since about june 2010, with absolutely no problems until now, I really really don't want to reformat, but will have to soon unless I can find a solution