Hi there! I know this is a bit OT here, because the actual problem is not nLite - but (maybe) caused by nLite. I have a 2xWin7 dualboot system and wanted to add a WinXp install (a certain program I need runs on XP only). Because I use(d) AHCI, I came across nLite, where I can integrate the needed drivers into a custom WinXp installation CD (don't have a floppy disk, so this is the only way to go I think). In nLite, I added the needed AHCI drivers, alongside with some registry tweaking (like "Classic Background", "WinExplorer Detailed View", etc.), and also already inserted the Product Keys of my XP installation disk. Ok, WinXp installation went fine until it came to inserting the product key - thankls nLite it already displayed the right keys, but Windows didn't accept it. It also didn't help to click "Remind me later", because the same screen again showed up. (btw I don't have a crack cd or so, it's regular WinXp Home Edition) After rebooting XP started from hard disk, same procedure, CD keys not accepted. At this stage I got a bit worried about my Win7 installs, so I did a Win7 boot recovery via the Win7 install disk. Which didn't work - XP still booted. Ok then, in BIOS, I changed AHCI to normal IDE. Repeated Win7 recovery, now both Win7 installs are okay again. Bummer is : now I can't install XP at all, even without AHCI. Installation stops with blinking cursor when the "Welcome to setup" screen should appear. Don't know: maybe there still is some XP in the boot sector (of course I formatted the hd where XP was installed), and XP can't get along with it? Maybe someone could give me a hint? System: Intel Core i7 Mainboard Intel DH55HC Ram 4GB Win7 HD1 OCZ-Vertex2 HD2-5 Samsung SATA Video NVidia Geforce GT220