Linux to XP-am I crazy?

As I mentioned in another question, I’m going to delete Linux from a computer I bought at auction. I’ll likely replace it with XP. Is this insane? I don’t have the password for Linux program and can’t get pass that part, so I’m guessing I’ll just have to erase or replace the hard drive and do a new install of XP? Should I try to figure out the Linux, or go ahead with the XP install? Any comments or ideas wiuld be appreciated. Thanks, Ed