Hey man. You need to find a floppy drive, and a working floppy disk. It's possible to use dos on a usb stick but it just isn't worth the hassle involved.
There is some software involved. nvflash and nibitor are the big two. The former you put onto a dos bootable floppy disk, the latter is used to edit the bios of the graphics card. I believe you can use gpuz to copy the bios off the card, but I would recommend sticking with dos.
The process in brief is
Make bootable disk, boot from it and copy your bios off the graphics card.
Boot windows, save it to your hard drive.
Edit it using nibitor, rename it and copy it onto your floppy disk
Remove all graphics card drivers, reboot into windows, then
Boot from floppy, and issue a command similar to nvflash -4 -5 -6 new.bios
Hit y a couple of times, it'll write the new bios
Boot windows, install quadro drivers
So preparation is fairly limited. I'd download nibitor and have a play with it for a bit. You can download someone elses 8800gt bios, and a modified version of it from here:
http://rapidshare.com/files/160384434/aquamac_Quadro_3700_Roms.zip open them and have a look around. In most respects they're the same. Note that the clock speeds are for an overclocked card in this example.
You then have the choice of setting appropriate speeds on the fx3700 bios from that link and flashing with that, or editing your bios to match the fx3700.
Either approach should lead to exactly the same result, I feel happier using a bios originally written for my card and slightly changed rather than a bios originally written for a different 8800 and changed in the same way.
Things are a bit more fun if you want to overclock the graphics card
