Unknown Virus Disables Bitdefender

I have Bitdefender Total Internet Security installed.

I have run MSE scan, Microsoft malware scan and Malwarebytes scan and all come back clear.

BUT, my Bitdefender on-demand scanner will not turn on and my live protection is disabled. Also, when I try a deep scan, it will not complete due to unknown error.

I'm thinking a virus of some kind infected my computer but how can I find it?

I have a Windows 7 HP computer.

Yes I have. And it still persists.

I've decided I'm most likely going to do a clean install on Windows 7 on my machine. Now I am just wondering if the clean install from USB will erase the content on my 2nd physical hard drive. It's not a partition and I plan on loading the OS onto my C: drive. I'd hate to have to move all my files onto an external hard drive.

Thanks for your response.

Jim

I would disconnect the hard drive. I just don't know how.

Now I'm getting BSOD associated with iastor.sys every 10 minutes or so. I can't even through restoring my iPhone to iOS6 without it giving me the BSOD. It just started today.

I'm pretty sure that if I restore using the DVD, it won't touch my second hard drive. My fingers are crossed.

Jim

Just got a blue screen right after clean install. iastor.sys.

Thanks for your help. Golden.

I appreciate it.

Jim