I bought a computer off of ebay without an operating system, then went to the auction for os's. I saw an auction ending in 2 minutes for xp home with sp2 and jumped on it (probably too quick) without reading the description carefully. Turns out I "won" an xp home upgrade with sp2
Now the question, can this serve as stand alone os

or does it upgrade an older windows program and reqiures an underlying os to function?
