Ok well first off, be a little more conscious about downloading certain softwares.

If it's a very popular piece of software then chances are there's gonna be tons of scam sites tryna jumble together deals and get your PC all messed up.

That in mind, get yourself a good PC cleaner that can deal with malware or trash files that get jumbled up.

Also, do you happen to use Internet Explorer as your main browser?

If so, drop what you're doing and get a different browser.

ANYTHING IS BETTER THAN INTERNET EXPLORER. ****ING CANCER IS BETTER THAN INTERNET EXPLORER.