Go to Control Panel click Troubleshooting and under Hardware and Sound click Config a Devise and run the Troubleshooter. Then download cccleaner free version. and run it to clear junk files and when download anything from any site always use Custom Download [and Untick everything you don't want] and Never Use Express Download as Automatically puts Crap and Junk Files on computer.

https://www.piriform.com/CCLEANER

I start by looking them up on google, fixing them, and then I test my fix.