eskimo,
I dont see any problem with your actual hardware, but:
1 - Check your power supply, 300W as minimum.
2 - Check your ram settings at bios, be sure u are not running with overclocked ram.
3 - Verify your ram, if you have more than one dimm, try them one by one and using different slots in each try.
4 - Get rid off Win ME, 98SE is the best.
5 - For your MB, download and install the latest bios.