GTX 570HD in mac pro 1,1 not working in windows

I have a mac pro 1,1 with a GTX 570HD graphics card. It works fine in Mac OS X, but it isn't working with windows 7.

I got the card a while ago, and it was already flashed to work with the mac pro when I got it. I did notice that sometimes the system recognises it as a GTX 570HD, and sometimes as an NVIDEA Tesla card...

I didint use boot camp to install winows, but I did use some of the drivers to get the keyboard to work properly.

When I used a diferent GTX 570HD that was not flashed for mac, windows 7 worked fine.

So is there a way to flash this card so that windows 7 and mac OS X both can recognise it? If so, how do i do that? Or do I need to swap graphics cards every time I reboot to windows?

(I have never flashed a graphics card before, and have now idea how it works...)