you mean there is no fan on the card itself? that could be it. i suggest you try underclocking your core until it is stable. the performance lost..will be minimal since its mostly memory bandwidth dependent, i know a geforce2mx is already slow enough as it is, but unless you want to keep that loud fan running, just lower your core speed till it doesn't crash anymore. or if you want go invest in a video card fan or slot cooler.
Athlon XP 1.58GHz | MSI KT3 Ultra2 | 256MB DDR PC-3000 | GeForce 4 ti4200 64mb @ 310/533 | IBM 120GXP 40.0GB | Det. 41.09 | DX 9 RC2 | Win XP SP1