Your config isnt really important , you can run ET wihtout any problem .
what are you using windows xp pro or win 7 ?

then the picture is frozen and my pc shuts down.
Do you get a blue screen ?

Someone already asked , but did you test with other games to see if you still have that problem ?

Once your pc shut down , open it ( cut power in case) and with your hand touch motherboard radiator , or graphcard / or processor to see what is anormally heat