Resolution Problem

I've made a post earlier about "Out of range" problem, Now that I know what it is i need help with fixing it.

Specs
q6700
4gb ram
asus Pdn mobo
2 X western digital 320 gb in raid 0
9600GT
Vista Ultimate 64bit

Well I bought this pc and the person had a 24 inch monitor and they had it set to a very large resolution, my monitor maxes out at 1440X900.
Now there is no onboard video and there isnt a way for me to change it in the bios settings
I've tried booting in safe mode, regular mode, and command prompt,
each time when I select one of these options there is a litle load screen in the middle and just about its to show the log in screen monitor goes blank and states Out of range.

So how can I fix this other that reinstalling?(im wondering if that would fit it even?

I was thinking about taking one of the drives out and puting it in another PC but its set in raid 0 and I've never messed with that so i would leave that rather alone