Computer endlessley reboots

Ok, as you can see in my signature my computer is a custom buitl one built by myself.
Now I was tomb raider legend today and it often crashed and came up to the desktop with at first an error saying something like 'Microsft Visual +CCCC or something the next error message that occured after playing tomb raider ofr a while was something along the lines of 'fatal error' and the last message said 'A fatal error has occured please refer to the readme for help' my mouse wasnt working I dont know why and the error message box ha d 2 options 'OK' and something like 'Detailed info' I used tab to get to detailed and it said 'Disc Error' or something like that. So I then moved the mouse and clicked on the desktoop after which promptly all icons and the start button everything except the background dissapeared.

So I restarted the computer via the resart button on the computer.
It asked me to choose as it always does when it crashes from safe mode and normal etc I chose normal.
The wondows symbol with the loading bar came up and when it finished I got a very very very brief glimpse of a blue screen with some text on it undoubtley BSOD however it was so fast even if I recorded it using a camera and played it back in slow motion you simpy could not read it and it did not all appear it was like when you switch a tv off.
Then it reboot.

I tried F8 during reboot and selected safe mode. This makes no diffrence all that happens is a command prompt style text 'list' just appears which is of course windows loading safe mode after which it restarts. In other words I cannot access anything.
I have some home video I was recently devoting my time to and many valued game saves as well as some very important documents all of which there is no backup of. Shows why you should backup I guess.
I need at least to be able to access these after which I could transfer them to my second hard drive and then reinstall windows however I canot access even windows.

There have been no recent hardware software or any other changes, the BIOS settings have been that way for over a year so it could not be a change in something.
Even yesterday tomb raider worryingly crashed often.
The disc of tomb raider is intact as I only bought it a couple of weeks back.
What on earth is the problem here? Also remember that that computer is NOT conected EVER to the internet as I am a gamer and prefer not to have viruses and spyware slowing my system down.

Someone please come to my aid ASAP.

Edited by Mitesh, 02 September 2006 - 08:00 AM.