Automatically logged out at start-up

A few days ago, I ran a Super Anti-Spyware scan, and it picked up a few viruses and spyware. I had it do its deletion/quarantine thing, and it said that I would need to re-start my computer for the deletions to take effect. I did, and Windows appeared to start back up normally. However, when I logged in, I was immediately logged back out. I have restarted a few times, and I've tried loading Windows in Safe Mode and have also tried Last Known Good settings, but to no avail. I assume that my anti-virus program inadvertently deleted some file crucial to system start-up.

I think that I still have my System Restore disk somewhere, but I'm not entirely sure. If at all possible, I hope to save some or all of the files on my hard drive. Thank you so much for any assistance you can give me.

 

Thanks! Can this be changed to resolved?