computer shuts down

when i tried to encode movies computer shuts down. (Have not tried it today)

when i used convertxtodvd and superdvd creator. days ago i used vaccum to get dust from inside the pc.

 

Is this a laptop or desktop PC? Using a vacuum cleaner isn't the best choice for removing dust due to the static electricity created.
I usually use a non-synthetic small paint brush on my desktop PC to remove dust from the heat sink, and a cloth with isopropyl alcohol to clean the various fan blades.
Did you clean the dust bunnies from CPU heatsink?

 

@plodr yes, but the disk error stopped. and earlier today the somputer did a physical memory dump. (kernel inpage error, atapi.sys datastamp. ) whats in parentheses was on the bluscreen.

 

Your last BSOD indicates that the OS tried to page in data from the page file. This data was corrupt, more than likely because your Hard Drive is failing rapidly and needs replacing.

 

Im using easeus todo backup to back up my harddrive ,now i hope i;m doing it right i went to system backup then clicked proceed and it says 6 hours remaining backing up. I been getting physical memory dumps so i use my hirenbootcd and booted from partion 1 i think and the disc is still in my dvd drive while i;m doing the system backup.