Well, being that the motherboard driver is apparently the final thing loaded before going to windows, i would assume that its that the motherboard is dead.. which depending on the type of computer, it might just be better to get a new computer.. and have one of your computer friends near where you live copy the files from your old drive, or have a computer tech shop do it..

Laptop or Desktop?

Typically in this case the files on the C:\ are actually fine, I've fixed this issues quite a few times - Happes most often with Windows XP, ... Problem is that you're also reporting a crash when booting from the CD. The best chance to fix is with a simple repair install from the CD - Just dont allow it to format anything.

.. Professional help may be needed to fix this.

A good chance is also a bad RAM memory module - The system may crash when loading to a certain point after having loaded things into memory up to a certain point.. Try running the computer with less memory installed, Perhaps just one stick or so..

..Another possible cause (yes, there are many from what you describe) - is the power draw is exceeding the ability of a failing power supply to keep up. Add-in cards like video adapters will begin drawing a bit more power as their drivers are initalized at startup.

Ouch. >.<

Hmm.. Sounds like it could be a hardware failure. Maybe a stick of RAM that has gone bad.

Could be the CPU overheating.

Could be the sectors where the OS are stored on has failed. :<

This is something a tech is going to have to probably look at personally. :(

I'd offer to look at it, but no doubt you are far away from me ^^;;

Since booting from cd is not possible the problem is probably hardware related

FIRST THING TO TRY:
Please clean the coolers before trying anything else.
ive seen many computers that started failing suddenly just because the cooler is dusty and causing the system to "choke".

Power-supply:
Power supplies do age over time. if you unplug some unnecessary things(extra-fans,DVD-drives,USB things)
you might free up enough power for the system to work more stable. altough unlikely

Memory:
Well if its the memory you could try to look if your system has 2 or more ram-modules.
if so try pulling one of them out and see if the problem happens faster or not-at all(helped me identify faulty ram quickly).
Memory is always the quickest to go broken(atleast with me....) or to act funny sometimes.

as far as i know you files are probably safe tough.

Ouch, good luck with that. When my laptop died, after I held the funeral service I went and found a great deal on a gaming desktop at www.cyberpowerpc.com hopefully that will help you. You might have to have someone copy all the files from your hard drive and then transfer them to a new computer.