If I didn't press a key, it would just restart (boot order is set to CD first then HD).
When I first put in the winxp CD, it wouldn't boot at all. I checked ASUS' website and saw that they have drivers for XP so I decided to go ahead with it.
The thing was way too slow and it had too many viruses on it. I have an ASUS laptop M51Aseries with Vista on it. So I've done a search on this and haven't found much help.