After regular Windows update I noticed that my video card's driver had suddenly stopped working. I made a rollback to a previous system backup and took a look at this video cards driver's information:
AMD's driver is not signed. And it is pretty strange. I Googled for a little bit and figured out that this type of video card is obsolete, but mustn't it always have a signature regardless?
To me, it looks like a faked driver which may being used to turn into a rootkit.
Sorry that the screenshot is in Russian, but it should not interfere with understanding the point