Didn't you know Toshiba also makes refridgerators? LOL But, seriously, if you have to refridgerate your lappy to keep it from crashing then that confirms you DO have an overheating issue. No need for any monitoting software; case closed
verheating. So if it is out of warranty you can either fix it yourself or have somone else do it for you. If you want to do it yourself, locate a factory service manual so you know how to open up the case in such a way that it can also be put back together again. Next, look for the obvious. Is the heatsink gummed up with dust? If so clean thourougly with pressurized air can. If it seems clean, then watch the cpu fan as you boot up and stress the computer. If it does not spin up, or runs very slowly, then replace the fan. If this seems ok, watch the gpu fan if it has one in the same way or the case exhaust fan if it has one. If all fans are spinning up nicely then pull the heatsink and really clean it. Next, clean the cpu die of old compound and then put 1 drop of Arctic silver or other high quality compound in dead center of your cpu die. A drop the size of a grain of rice is correct. Then replace heatsink making sure you redo wahtever restraining scheme the chipset uses. The pressure of the heatsink will spread the Silver correctly. If the laptop is still overheating after this then you may have a crack in mainboard that only shows up when the temp rises in which case taps for that board. All these steps are very doable once you get over fear of cracking open the case.
Good luck