Odd behaviour.Not much to go on.The first thing I would do is try it (receiver/software) on another computer.If you're running XP 0r 2000 you should get an event listing in Administrative services.That will help narrow the cause of shutdown.Normally a software/hardware conflict will shut the computer down, or reboot it soon after startup, not after 15 mins.I would also look for a computer overheating issue.Spyware & viruses can also cause system shutdowns.