Alright so I'm building myself a computer with new parts, and I'm getting a free Win 7 OS late December, but I'm getting my computer built before then. So to keep my OS(XP), do I re-use my hard drive in the new computer until I get my new OS? My Hard Drive is a model drive, so I don't know any information about the hard drive, I don't whether if it's IDE or SATA, as my computer is almost 8 years old. So I just need to know how to keep my current OS, I think I just re-use the hard drive, but I'm not exactly sure.