Could you believe that I just reformatted and reinstalled Windows and the problem came back?
I decided to do that yesterday because it was getting totally out of control (it affected all of my browsers and it got to a point where new Chrome windows opened every time I pressed the delete or control key!).
Well, that's happening right now, again. I think it started a few minutes after I reinstalled google sync (but I can't be sure if it's related).
To be very specific:
I reformatted and installed Windows yesterday (Saturday).
Reinstalled Malwarebytes and AVG before anything else.
Copied most of my documents to the PC again, also yesterday.
Today I started using Chrome with my account.
Also today I installed some of my common-use programs (nothing risky like UTorrent or Jdownloader, and I did download everything from the provider page).Installed google sync, started to synchronize some documents from work and was checking out a google sheet (on Chrome) when I noticed the tab went blank.
Ignored it, reloaded the sheet, but it went blank again and after a minute numerous new tabs and new Chrome windows started to pop up.
Some keys appear to trigger it (control, delete, ') but I'm positive it also happens on its own, when I'm not using the keyboard or even the mouse.
I have no idea what to do now, but at this point I'm totally willing to give up my stupid google chrome acount haha or even my documents, if that's somehow causing the problem.