ive got a k6-2 500 on a soyo sy5ssm

windows crashes for no reason.. the temp is around 50c (is this too hot?) and i have a regular heatsink and fan. i am thinking i need a better heatsink/fan.

if i am wrong about the heat, can i lower or raise the voltage to make it more stable? currently at 2.2v. i have no idea why it crashes.

another thing. its got 64meg pc66 ram in it. will this affect it? any ideas comments?