GTR 2 - Shuttdown to desktop

Hi guys,

Just reinstalled my late GTR2, as I got a new G29.

Until here, super. Followed the installation, but got a bit confused because the Nvidia profiler didn't start.
I kept going with the installation, and I got the game running. The thing is, as I play, 10 or 15 mins sometimes less, it shutdowns and goes to the desktop.
i lowered the specs and still, it keeps shutting down. It doesn't crash, simply goes away.
I attached my specs. It is a Toshiba LapTop.

Thanks in advance!