go to control-panel/system/advanced/startup and recovery/settings, and untick the box that says "automatically restart"
This should now give you an error message, instead of re-booting, and lead hopefully to sorting your problem.
WPA2 hack: How secure is your Wi-Fi?
Add Depth Of Field to a photo using Tilt Shift Blur in Photoshop
iPhone tips & tricks
Comment afficher des fichiers cachés sur Mac ?