I'm running Windows 7 Ultimate and I think it's great. I'd be even more pleased with it if I can make the problem outlined below just GO AWAY
With XP and then Vista I used a fairly old 42" Plasma TV as my main monitor. It's not an HD device, the max resolution is 1280x768 but I like it and never had any problems, my graphics card is Nvidia GT6700 XL.
Since installing Windows 7 the only way I can make it work is by plugging in another monitor to the DVI output. If I detach this second monitor the Plasma immediately goes "Out of range" The first time this happened was during the install of Win 7 itself. I think that windows is always adjusting the resolution to 1280x1024 which my old telly just can't do. It's driving me mad, I only want one monitor and that is the Plasma.
I already downloaded and installed the Nvidia Windows 7 drivers - no difference.