I just used an OEM install disk from an "old computer" which I no longer possess---it drowned in a flood.---to install Windows XP on a new to me--older computer. It looks like XP is working, but everytime I start up, it prompts me to activate XP, but THEN it tells me that activation has already occured, and gives me no other options. What is happening here, and can I fix it, or will it just go away in 30 days?