Help with pc after crash.

[Jedi]

Ok firstly a little about the pc:
Its made by a norwegian company that put it together, called Komplett.no.
Operating System: Windows 7 Ultimate 64 Bit.
Processor: Intel Core? i7 Quad Processor i7-860
Quad Core, 2.80Ghz, Socket 1156, 8MB, 95W, Boxed w
Memory: Kingston DDR3 HyperX 1333MHz 4GB
Kit w/2X HyperX 2GB DDR3, CL7-7-7-20, 240pin
Harddrive: Western Digitial Caviar® Green 1,5TB
SATA, 7200RPM, 64MB, 3 GB/s

Earlier today as i was playing on TC 1: Jamaica, it had a few freezes, i have been playing since 11am and it was about 6-7pm when it crashed.
It without warning just crashed and got stuck on the bootup, it continously loops the Boot up repair, though im not sure what to do and if i can do anything there to fix it. I opened up the case and made sure it was already clean of dust inside.
I have never had any problems with my pc crashing like today.

Grateful for any help.