requires Win95, Win98 or Win98SE presently installed or original installation disc or CD.
A Win98 upgrade disk will work and I believe WinMe will work as well.
And it should be a instore purchase. Some folks have had a problem getting the rebate printout after buying online with instore pickup. Some report success as well.
I ordered online with instore pickup, they would not give me the rebate, but I got home and opened the bag and they had given me XP Pro. So I got the rebate after all. : )