3820T BSoD MACHINE_CHECK_EXCEPTION

Hi,

I have an acer 3820t running on WIN7 and since it came back from the acer repair service i had plenty of BSOD, at the beginning it was not very often but nowadays i cant keep my computer more than 4 hours on withotu having this message:

022212-23618-01.dmp 2012-02-22 19:24:31 MACHINE_CHECK_EXCEPTION 0x0000009c 00000000`00000000 fffff880`031dbb70 00000000`00000000 00000000`00000000 hal.dll hal.dll+12818 x64 ntoskrnl.exe+7cc40 C:\Windows\Minidump\022212-23618-01.dmp 4 15 7601 262,144

its an extract from bluescreenview and my minidump.

here is a screen if maybe it can help more




Its a laptop im always using without battery and of course acer cannot do anything. I wonder if its not a ram problem because it seems to occur most often when i ve several programs loaded. I've looked over the web for some answears before posting here but couldnt find anything that would help me.

Im still using it since i use it most of the time to type my courses and they arent long enough to get the computer to get to the point it crashes but when im at home its seriously irritating.

Hope you can help me !

 

heeeelp please