Random reboots are usually caused by heat, memory, driver issues or even the power supply. You need to investigate each one to rule it out as the cause. Are all of your fans working? Is the inside of the case full of dust or dirt? Start there. You can also view the event log for possible clues as to the cause. It may identify some hardware that may have a driver problem. Go to start, my computer, right click manage, and view the event log. Look for those with the red x at the time of the crash. You can right click and view properties for details. You can also send a report to M$ and view their knowledge base for possible cause and fix.
In safe mode:
Right click MY COMPUTER, choose PROPERTIES, choose ADVANCED, choose the SETTINGS button in the Startup And RECOVERY section, and uncheck AUTOMATICALLY RESTART
Now reboot. This will result in the BSOD error...report the STOP ERROR and any parameters.
its not that my computer is clean, and my settings are all ready set to NOT automatically restart.
what i need to no now is, is there a problem with steam or CS:S as it only crashs when i load that up.
similar problems are happening on my brothers computers aswell.
do any STAFF play CS:S or have steam, if so is this happening with you aswell.