I would suggest checking with John DeRosa about anti-virus software that may already be running on that machine. John installed the whole thing a couple of years ago. He’s out in UT flying this week but he can be reached by phone or text message at 224-848-2063.
From a safe computer download and run Stinger. That should catch most problems. After that install malware bytes or similar software. Since the computer is open and we do not block visits to dubious sites and we have no idea if someone plugs in a USB stick with malware on it that will be the best you can do for now.