I have two PCs running XP pro sp1, they share an ADSL 512kps Internet connection, via an Acatel speed touch usb modem. My main rig is the gateway and a use this for gaming and the other rig, P3 1.1 512 meg of Ram. for Kazza, video editing, testing stuff etc. If I leave Kazza downloading under normal conditions it is ok. But if I start to play games on the main rig it reboots itself about once every hour. It only ever happens if the second rig is downloading I have the latest BIOS and drivers and I up graded my power supply to a 350 watt approved one. Any ideas why this is happening.