Anyone have an overheating laptop GPU problem?

[Muchew]

I have been having this problem lately where I play games, and after a little while (usually during more intensive parts of the game -- ie casting spells etc) my computer suddenly turns off.

At first I assumed it was my CPU overheating but after running some temp sensing program, it appears my GPU is getting around 101C before turning off.

I have tried using compressed air to clean out the fans, and today just ordered a laptop cooling station. Anyone else familiar with this problem?

Dell Studio 1555 Laptop
4gb RAM
ATI Radeon 4500/5100 series
Intel core duo 2.4ghz
64bit windows vista