My PC has developed an issue where about twice a day it will spontaneously reboot with an entry in the event log of "System Error" 1003. I know you will need more information and I will provide that (event viewer data, minidumps) when I'm back home and have access to my computer (I'm currently at work). I've done some searching on the boards and found a few things to try to fix. Being at work I don't have all the details or access to the minidumps and will supply them once I get home. But I did want to bring up and interesting aspect of this problem to maybe get people thinking about it. I get two different error codes. When the event occurs in the AM hours I get 1000050, in the PM hours I get 1000008e. I find this very odd. This just started happening a week ago and the system has been running fine for the month or so before that. It's a newly built system with new MB, mem, CPU. I added another 512MB of memory recently so that is my prime suspect at this point. I'll be either running a memtest on it or simply removing it to see if things improve. If anyone has any ideas before I post additional information I'd love to hear them.