I formatted by Sony Vaio SZ75gn to windows 7. I'm having a hard time in making my other video card work. I'm using the built-in by intel at the moment. Have to figure out how to make it work. I tried looking for it in the BIOS and device manager. I also slid the slide to the other video card but to no avail.
If you do a web search, there are no Win7 drivers for that model, you may be able to use the ones directly from the video card vendor (nVidia maybe?). Check system compatability before installing an OS next time, quite a few people only check things after they are broken.