I agree with Jura 11.  First step is run Malwarebytes Anti-Malware.  Don't just run it once. Run it at least twice or until the problem is solved.  Take note of what Malwarebytes is finding and trying to remove because you may have remove it manually.  Removing malware shouldn't be a big long and complicated process that requires changing a bunch of things and coding.  

Ransomware can be defeated, it's just that some are more difficult than others to get rid of. 

Never update from a pop up even if it looks official.  Updates like that train us to just click without reading what updates are actually being installed.   If you get a pop up to update take note of what software it's for. Let it close "most official" pop ups will close on their own.  Once it closes open the software and update directly from the software.  Do this especially with Adobe Flash.  Type in adobe's website and update from there and never from a pop up in the browser.