Okay, I've been using the old WMP ver 9 with my XP Pro. After validating my copy, they allow a download to upgrade to ver 10 which come with XP Media Center only. Is it worth the upgrade? Also, I've notice, sometiems when I play an mp3 file downloaded from the internet, my WMP would change the file's date and time to present date & time first time playing it. It does this with some files only though. I think it did some modification but I don't see any change in file size.