Fatal Exception

I am running windows ’98 with a 667 Mhz Celeron processor. After the machine is idle for a short time, I get a blue screen that says “Fatal exception 06 has occured at 0000.00000017. The current application will be terminated.
When I attempt to continue, I get no video and it freezes. I have to reset or hold the power button in for several seconds to reboot.
Any suggestions?