Well if you have NOT fiddle with the drive, here's what you do........get access to a decent computer with updated anti virus and pull the hard drive out of the infected computer. You can hook it up with a VERY handy USB connective device, which you can buy cheap. This essentially works similar/ like an external hard drive, except these "kits" are meant for temporary use, like this:
This is the type of thing you need......Has a power supply, and will fit THREE types of drives......standard desktop IDE or laptop small IDE drives, or the newer SATA drives
https://www.amazon.com/dp/B002OV1VJW/?tag=joeychgo-20
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You boot up the "clean" computer as normal, connect the infected drive, and use your clean computer to scan the drive.