restarting computer

I dont know wether this in the right place buts its more to do with my computer then gaming so. Basically when i try to connect to gaming servers (counterstrike source) my computer automatically restarts (reboots) itself when im sending my client info to the server. Up until this point of connecting steam runs fine. Ive tried changing settings in my firewall protection program such as program permissions and various other functions but this has no effect.

when my computer restarts windows compiles an error report which contains these files

C:\WINDOWS\Minidump\Mini030105-06.dmp

C:\DOCUME~1\Owner\LOCALS~1\Temp\WER33.tmp.dir00\sysdata.xml

Has anyone got any idea what the problem could be your input would be appriecated.

 

still no replies maybe im the only person in the world with this problem but if anyone can help please i would be really grateful