Windows defaulting to 800x600

Whenever I restart or boot my computer, I get the login screen at my default resolution of 1400x1050, but when I log in, Windows resets it to 800x600, and it stays, no matter how much I set it back.

The problem started after I was using my s-video out to output to another video card in another computer. Does anyone know off the top of their heads where possibly an XP registry setting is or something that would cause this, or is it specific to my display drivers ?

Thanks....

I would attribute this only to the graphics drivers. Are they installed correctly?

They were, but I suppose something could have gone wrong.... I could just reinstall them I guess....