Yesterday my font in Chrome suddenly looked different, so I did a virus scan just to be safe, and the BitDefender free online scan detected Gen.Variant.Kazy. (In retrospect, I'm pretty sure the changed font was actually because of a Chrome update, not the virus.) I originally had Avast AV on my computer, and after finding the virus I purchased Kaspersky to replace it, but neither scanner could detect the virus, and neither could Spybot S&D or Malwarebytes. I wondered if it was just a false positive, but eventually I just deleted the file that was flagged by BitDefender and the next scan showed my system was clean.
I noticed that my wireless connection kept turning off for no reason while I was working on getting rid of the virus. I also found that AdBlocker was destroyed--it still showed as a Chrome extension, but it wasn't working and had apparently been gutted.
I reinstalled AdBlocker after I got rid of the virus, and everything else seemed normal. However, I just tried to log in to two of my online banking sites and was warned by Chrome that "You attempted to reach www.[mybank].com, but the server presented a certificate issued by an entity that is not trusted by your computer's operating system. This may mean that the server has generated its own security credentials, which Chrome cannot rely on for identity information, or an attacker may be trying to intercept your communications." As I said, this happened with two different banks. I tried to access the same sites from my other computer, also using Chrome, and received no such error message. I've never seen a message like that before.
I have also felt like my computer is running somewhat slower today, but of course I'm paranoid at this point. My major concern is with the message about the certificates being faked, which seems to suggest I've still got active malware on my machine. I'm still getting nothing on scans by Kaspersky, Spybot, and BitDefender's online scanner.
Any ideas? I'd really rather not send all my savings to a hacker somewhere if I can avoid it. My OS is Windows 7. Thank you.