Having two systems set up the same way exhibiting the problem in question is not usual. If just by clicking on the "Start" button in Windows, the system restarts, and does this randomly, and updating the BIOS has not helped, I'd next suggest the following:
1. Just to be sure, see to it that Device Manager reports no conflicts.
2. If there are no problems shown by Device Manager, then, check that you initially followed the Critical Driver Installation order, with the most current drivers, as outlined here:
Hello everyone, please help me. I am using an intel dg41 wv motherboard and 2gb ddr3 1333 mhz dimm ram but on installing windows 7, after completing installation, at the final restart of installation computer does not show any desktop & get stucked on pres any key boot from cd or dvd......and if we restart at this position, mobo give 3 continuous beeps with a pause and continues until the power is off. But one thing is as per the intel dg41wv official page :-
System memory features
The board has two DIMM sockets and supports the following memory features:
Two 240-pin DDR3 SDRAM Dual Inline Memory Module (DIMM) sockets