Try using firefox, and run the adblock plus extension, see if that helps at all. But a scan with Malware Bytes Anti Malware and with Spybot Search and Destroy wouldn't hurt. Also, just a preference, because I used to use AVG. Try Avast. Seems a little better than AVG, and one thing I love is that it has a pre boot scan option. I also run PC tools firewall plus. It should alert you if anything is trying to get in your computer.