I have purchased a new Intel Desktop Board (essential series DG41RQ) six months back....and now it is troubling as it is restarting again and again....It is restarting anywhere that is in the BIOS setup, in the boot menu, in the windows and wherever it is found to be on///////////
Did you try the booting troubleshooter on the Intel website? http://www.intel.com/support/motherboards/desktop/sb/CS-029511.htm
It suggests some things that can cause random reboots, including BIOS setting changes.
This page offers troubleshooting tips for your board: http://www.intel.com/support/motherboards/desktop/sb/cs-010254.htm