you can download and run malwarebytes on that, you may have to temporarily expose it to the internet so it can update definitions
It should clean it up
As a side note, one doesn't really need to get 7 to avoid viruses. It's just as easy to hose a windows 7/8/10 system if you don't know what you're doing.
Consider using an antivirus to scan downloads from the internet before launching them, and also stay away from shady websites.