this is my problem: I use winnt.sif and svcpack.inf. I have pre-installed Norton Antivirus 2003, Adobe Reader 6, WinAce 2.11 and drivers. I have modified the dosnet.inf, hisft.inf, sfc_os.dl_. I have downloaded all the hotfixes finded at this adress http://board.msfn.org/index.php?showtopic=8741 I removed Q817787 hotfix. The same message. I have used 2 instalation cd of Win XP Prof SP1 with the same "*.cmd, *.inf and *.sif" files. I dont know what to do more ... Thanks all