pc became excessively slow

Hi,
i am using a sony vaio laptop-i3, win-hpx64, ram-3gb, graphic card-256mb, hdd-320gb

few days back my pc was shutting down again and again due to heating problem.
fan was not in a working cond.

but now since that problem has been resolved, now i am facing another problem.
whenever i start my pc windows doesn't boot up, afetr the animation logo,
i tried in low resolution mode and last gud configuration, but didn't work.

when i boot up in safe mode, i boots up but takes 15 mins to boot up and when explorer shows up, it's very very slow.(p.s. can hardly refresh).

i tried to run windows recovery partition, but that too is very slow, and doesnt goes ahead of PLEASE WAIT..

i treied to reeboot the windows with the help of another cd, but process is also very slow...

plz help and tell wat shuld i do...
thanx

There maybe system files that are corrupted. Run SFC /Scannow three times and report back.

SFC /SCANNOW Command - System File Checker

hey theveterans,
thanx 4 replying.

i tried sfc, but in command prompt, it shows
"The offline image has a different platform architecture thanthe runnung system.
This is not supported for system repair.
X:\Sources>"


now wat to do..

one more thing it is showing one of my partition as RAW instead of NTFS in "list volume".
wat does that mean?