I've been wanting to update my BIOS & ChipSet (not sure if same thing?)
They're not, BIOS - Wikipedia, the free encyclopedia Chipset - Wikipedia, the free encyclopedia
Asus has nothing to do with the drivers they all come from Nvidia, about all Asus might do with them is change the installer slightly so that it includes their name. Also Nvidia declared the NF4 legacy status quite a while ago (shortly after Vista came out), and there will be no more NF4 drivers.
You have a couple of options with that NF4,
1. Use it with the drivers that Windows installed (which come from Nvidia), which are sufficient for everything to work as it should.
2. If you really want something newer than what Windows installs have a look here, View forum - nForce Drivers • nForcersHQ.com
Personally I would just go with option #1, and did with almost the same board as yours (A8N-SLI SE) and it works as well in 7 as it did in Vista.