Dual video wont show up in xp 64 bit?

been all over google no answers, got windows xp 64 bit install, second video card refuses to start, keep getting error 10 on any card that i can verify working. The onboards got dual video out put, vga and dvi. DVI refuses to start up, it can be seen in the display options but refuses to start when you select extend desktop on to this monitor. Had xp 64 on the machine for less than a day and already hate it, and NO I WILL NO SWITCH TO 7 or VISTA, so drop that already. Theres gotta be something i need or am missing, the video drivers are all up to date, everything is installed right, cords are all good, so why no second video card or second output?|||The problem is most likely a setting in BIOS that you haven't changed or a jumper on the motherboard that you need to set. Double check the settings against your motherboard manual and if everything checks out more info is needed on here. You could also just be unlucky and received a DOA video card.