Invalid Format on TV display

Okay so I have a Sony Bravia KDL-26M4000 TV that I used to have set up as my display with Windows Vista at 1360x768 and it worked perfectly
I upgraded to Windows 7 some time ago and it stop working. Every time I plug it in the TV displays the message "Invalid Format"
I am using a HDMI to DVI connection just like I had used on Vista and am set for the same resolution. It worked for a while on Windows 7 on some older drivers for my GeForce 260, but I want to be able to use the newest drivers and have my TV work as a display. Any suggestions?

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