I recently had to reinstall XP (I know, but I like XP). Encounted many problems, but think most of them, if not all are fixed. However, when I tried to install Windows 2000 from a CD that I have owned for many years and installed on succeeding PC's, I got a message that "said we are unable to verify your license number", multiple times. I bought a new Windows 2000CD still in the original packaging from eBay, a very reliable vendor, and had exactly the same result. I did it multiple times with both CD's to make sure I wasn't making a typo, but the implication was that I din't have a real license number. Thru the years, I have installed that CD many times with no problem. HELP??