Hiiii I have a slipstreamed Xp (Sp3) Cd with IaStor.sys installed supporting AHCI mode. I using the http://unattended.ms...g/unattended.xp way to get it implementet on the Xp Cd. This work fine if AHCI mode is enabled in Bios. If not - Xp been installed in standart Ide Mode. It works fine, but now i see some of my machine have a error in Event viewer saying: Error on IaStor.sys, drive not respondig, timeout and so on. The IaStor.sys are the latest version and matching the chipset in the machines. I realy need to get back to Ide mode, i can't reinstall this machine because of license problems in the installed software. Earlier i have observed some registry change in this forum i be able to use, but now i didn't find them anymore. This worked fine, i do the change, rebooted, get direcly in the Bios and set Ide mode, then restart again and all was OK. I find a lot of text how i do this in Vista, but that's not work for me. Can anybody help me ?? Best Regards Christine