PC Locks up

[sandymiller@blue]

After some time I have returned to play HL2.
However, now it locks up the PC after 1 or 2 mins playing!
Full re-boot is reqd each time.
I?ve removed all unwanted progs from loading up on start.
But still the same.

Can anyone offer any help please?

Thanks
Sandy

 

[Barney Fife]

Probably: Heat?