Unless Windows 7 has unique characteristics that I am unaware of, the affinity thing is only necessary after the game graphics come up. Before that, when the "clanking" is heard (not very descriptive), you are at the main menu, which should work fine. A crash in the main menu probably means that something else is wrong. If you can fix that, then you can set affinity manually using the Task Manager while at the main menu, before starting a mission.
I am not sure what you mean by "Nvidia drivers fix" and why drivers don't work with 64 bit. You should be able to get drivers at Nvidia's web site that are compatible with your 64 bit (x64 I presume) operating system. Maybe you downloaded the wrong file.
Please describe your problem and attempted fixes more precisely. Also, list your system information, including CPU, graphics card model, and its driver version.
"What we've got here is a failure to communicate", the warden (Strother Martin), Cool Hand Luke