After reformatting both my MAC and BootCamp partitions, I installed Windows 7 in the PC partition. Now the MAC side will recognize the 2nd monitor, but the PC side does not. It did before running XP. Called Microsoft who recommended I download new NVIDIA driver. I downloaded NVIDIA's 266.58_desktop_win7_winvista_32bit_english_whql.exe which was supposed to work with XP, Vista and Windows 7, but the computer would not accept it. Any suggestions?
Having the same problem... I've been reading a lot about this and nothing solved my problem... now that you sad that windows XP works I'm thinking about installing XP.