Ok, I had to setup my HDD on the normal ATA33 channel because I could not get access to the required ATA66 drivers. After installing the ATA66 drivers and running every update for XP I shutdown and tried to switch over to the ATA66 channel. When the system started the XP boot process(after the bios post but before the Windows XP splash screen)I get a hardware boot error. It basically says that it cannot find the boot device. Is there somthing I have to do before switching to the ATA66 channel? Or am I a total dumb@$$ to think that I can do this at all without reformatting? 🙁