I think I have a virus and I think it came from Facebook. Damn Facebook!
Yesterday when I started up my home computer, a folder named "Common" popped up. It had two files, "helper.dll" and "helper.sig". Both were installed the prior day at a time when I was only in Facebook. "helper.sig" appears to be modified whenever I go online, whereas "helper.dll" appears to remain unchanged.
I ran McAfee virus scan (quick and full) and it turned up nothing. I also ran Ad-Aware which got rid of cookies but detected nothing critical. I also ran some of the McAfee cleaning fixes which got rid of a lot of junk, but the problem still exists. I think part of the problem may have been that there were 5 Microsoft updates that kept aborting so they were not installed on my computer; it took a few tries but I got them to install but it may be too late if something is on the system.
Also, now I can no longer even access the internet. Even though McAfee doesn't find a virus, it now blocks internet access with the "buffer overflow" warning. What little I was able to find online suggests that this is a protective response to the virus attempting to send information from my computer to the internet.
i have found lots of "fixes" online but none on McAfee, Microsoft or other legit sites...not being a technical person, I didn't know which to trust or which might want me to download stuff that will give me more viruses or not fix the problem. I posted a thing on the McAfee forum but have gotten no responses yet. Can anyone help???