My mom, who is elderly, allowed a scammer to remotely gain access to her computer. They told her she needed to pay $200 for them to fix the security breaches she has. She allowed them to remotely access her computer but didn't give them any credit card info when they asked. I deleted the remote access file (don't remember what it was called) but I'm sure they put something on there where they might gain access whenever they want.
She has a windows 7 computer. Should I keep it offline and use a CD for the programs I need to run the test, or would it be safe to get on the internet with it? Any advice would be greatly appreciated.
Thank you.