I am currently using a cut down Windows XP Professional SP3 that seems to not have the Media Transfer Protocol. It probably wouldn't matter, except for the fact my zen player apparently needs this service to run, and the drive for it will not install without the mtp service. The problem is, I can't for the life of me find out where it was taken out from, within the options of nlite, so I don't make another installation without it.. Before you ask, yes, I have rolled back, reinstalled, ect, WMP.