Been down the Windows installation route many times and usually no problem. I am just wonderin if you have the correct disk for your system. If I read your first post correctly. It sounds like your rescue disk is trying to cure problems for a version of Windows different to what you are trying to install and setting something on the hard disk for 32-bit access - just a guess. Have you tried preparing the disk partitions using GParted or the Disk Utility from the System/Administration menu.
Often the Supergrub boot disc can cure problems like this. It might be worth getting hold of one if you can.
Here's a thought... try swapping your video connection off the add-in graphics card for the on-board. Is this possible? Do you have an add-in card? You may have to set the BIOS option for graphics to choose the on-board first.
If this gets your Windows installed you'll know that you need to install your NVidia drivers next.
Hope your situation improves soon. I have been there and it's not nice. Good luck.