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.
But doesn't seem to be the exact virus you have. Anyways, anything that makes the CPU work at 100% without users consent is usually a virus. Use some kind of antivirus or thoroughly format your drive to kill it.