Let's try some checks for malware and adware:
1.) Update your Anti-Virus Definitions software and run a full scan. Follow the prompts to deal with what it finds.
2.) Download and install Malware Byes Anti Malware- Get the free download only. Uncheck the Trial version if prompted at installation. You just want the On Demand Scanning. Follow the prompts for what it finds:
3.) Download Adware Cleaner and install it. This will help get pop-ups off your PC:
Follow the prompts. Now close out of everything and reboot your machine.
Next, go to your favorite browser(s) and search for Ad Block Plus within them. Download this wonderful Ad Blocker. It will stop about 95% of ads on web pages and ads on You Tube as well! You will need to do the steps above first to scan your system for malware and adware.