Dell Latitude C400 Windows 7 Beta? -

I own a Dell latitude c400 laptop and recently I install the Windows 7 Beta OS. Everything went great installing the beta OS and it runs great on my laptop, but the one problem is my resolution on my monitor is too big. I try everything doing a windows update, reinstalling my video controller driver, and changing my display options, (no luck) My video card is a Intel 830m or 855m graphics card. Does anyone have a solution on how to get my resolution fixed? Maybe a vista driver? P.S I know the Latitude C400 was not made to run Windows 7 or Vista according dell, but I do not see any issues running those Operating systems. Please and Thank you

Believe Dell

You should not have installed Windows 7; it is a BETA. Format your PC then run it in a virtual machine such as VirtualBox