|Do you have antivirus software installed on your PC?|
If yes, run a check of your system. If no, download, install and run one. I've heard good things about "Avast"
Do you have antispyware software installed on your PC?
If not, I highly recommend you download, install, and run "Malwarebytes" (google that). It sounds like you may be getting stuffed up with spyware.
If you do have antispyware installed, run it and if it isn't the app I mentioned above, download, install and run it too.
Also, you might want to check and see if there is a more up-to-date driver for your video card and if there is, download and install that too.