Reformat your SSD then install Avast + malwarebytes. Avast free is still even ok.
I don't trust Avast I need 1000% secured PC.
You can't get 1000% security. You can't even get 100%...
Reformat and malwarebytes are good. You should install some scriptblocker for your browser (noscript for firefox for example).
Most important is to adjust behavior: Don't follow all links, don't download and extract all things you're offered. Be paranoid to some extent.
If you have really sensible data: Cut off that computer from the internet and encrypt all data.
ya.ya.yo!