Windows XP, Home Service Pack 3, OEM. I do have a legit copy of Windows XP Home, but the copy i used was one i downloaded because it had SP3 already integrated. I would try using the SP1 disk, but its cracked and no-longer works. If there's one you suggest i find please let me know. I also installed vista on the laptop temporarily if i should compile it on that. When i put the downloaded disk image into the laptop, it gets to the screen that tells me there are no hard drives in the computer, meaning it gets passed that part of the installation. Thanks ~Cody Woolaver