OK We tried to load Service Pack 4 on 2 dif machines ,,Dell and a Compaq,,The Compaq was reformatted with a clean Win Nt 4 install ,It was promoted to a PDC then an inline upgrade to Win 2k Server,,with service Pack 3 installed,,no Problem ,,and it was fine ,this machine is not in production,,the upgrade stopped with a message that it could not complete the upgrade and that it would be necessary to restore the OS with the ERD and win 2000 disk,,we didnt create the ERd yet nore did I runthe upgrade with the Archive feature to do a turn back,,the SEcond machine is in production ,It is a Dell brand new out of the box ,,fresh Copy of Win NT 4 Server ,SP 6a,promote from BDC to BDC ,,then perform inline upgrade to Win 2k Service Pack 3 ,,both were working fine,,so then I proceeded to do the Win 2k service pack 4 and they both would bomb out telling me the previous error message yet once I reboot it says Service Pack 4,,HELP