If its just the files you want, I'd buy an external drive caddy, sling it in there. Boot computer into safe mode, plug external caddy in, scan with av and malware bytes. Move your files over, then format that drive (low level format).
That way, you keep your files, have an external hd for backing them up once you've removed any virus/malware etc.
Then again, I'm like that.
Wurzel