My computer is doing all sorts of crazy things. I have had disappearing files for many months.
Last summer I ran my computer through a battery of tests for malware here and it came back clean. Following that, I took my computer (Toshiba laptop Windows 7) into a repairman to have him check it out. It passed as working properly.
Then I started having issues with disappearing files, files I had just created not appearing in the folder In which I stored it. It went far deeper than that and you can read more about it in this link:
I've had a few blue screens and twice my computer completely froze and I had to remove the battery to get back control.
I am very active in Flickr and for the past few months I have had lots of issues with it. I use Firefox as my browser. Today I signed in and did some Flickr things and email, and signed out. When I tried to sign back in, I was directed to a link that seemed to be about challenging my password. And I couldn't get into the account. I also could not update Firefox to the newest version, which just came out recently.
I uninstalled Firefox, reinstalled it, and was able to sign in. When I left email, I got a screen telling me I was infected and had to call a phone number and talk to a Microsoft agent, and that just ignoring this would result in Microsoft denying me access to the internet via Windows. I didn't click the link or call the number. I've seen these scams on YouTube. If you need to see the msgs, I attached them in the thread link listed above.
I just scanned with AVG and Malwarebytes and nothing was found.