iMac 2008 (24") Running Windows x64 BootCamp - NVIDIA Driver Crashes Everything
this is Gidoza (original poster) I'm just responding from elsewhere so don't mind the name change.  :)

I have Mac OSX El Capitan - it originally worked fine, and I installed Windows 7 x64 through that.  I used the standard BootCamp software that could be downloaded for this brand of computer, the latest version...I don't recall which one that is though.

Sorry, but I don't know what a BIOS or an EFI is.