I have installed XP Pro on my AAO, and I cannot run the System Update. It tells me I need to be an administrator, which I am. I've gone through several sites which outline different methods, but I haven't been successful yet. I am using a legal XP Pro, but I had the same issue when trying the XP Home recovery disc. My system is a AAO, 1.5G RAM, 8G SSD replaced with 16G CF card in case that matters