In order to use the 6200 PCI in Windows 7, you will need to download driver version 295.73 or earlier. You can find the 295.73 driver here:

64-bit: https://us.download.nvidia.com/Windows/295.73/295.73-desktop-win7-winvista-64bit-english-whql.exe.

32-bit: https://us.download.nvidia.com/Windows/295.73/295.73-desktop-win7-winvista-32bit-english-whql.exe