ADWARE, SPYWARE, MALWARE.
Are you infected with any of these? You probably don’t even realize it, so take some precautions. Some signs are windows popping up or things slowing down. Try one or some of these programs listed here.
All though these are great tools, you can still get into trouble and may not be able to resolve by yourself. Also remember, the bug comes before the cure and these programs are only as good as you keep them up-to-date through updates & subscription services.