>>1 Reinstalling Windows is a bit excessive in this case, you should be able to resolve the issue without resorting to that. It sounds like you've acquired an adware virus somewhere, either on your computer, or more likely, something messing with your browser. I would recommend reinstalling a clean copy of your browser, making sure to delete all the data from the previous copy, then installing a good adblocker. As well as this, if you don't have one already, you should install a good antivirus and do a full scan of your system to check for malware. Hopefully, once you've done all of this, it should resolve your issue.