Since you changed the PC by replacing the motherboard, you need the drivers for the motherboard from the maker of that new motherboard, not from Dell (unless it's an exact replacement, but then there is no need for reinstalling Windows).
Hello , i just got a new motherboard and cpu. I also had to reinstall windows. Now when i log in i have no connection. When i troubleshoot the problem it says " Windows did not detect a proberly installed network adapter " i have tried install drivers but nothing worrks.
The motherboard is a dell and i downloaded the drivers from here http://www.dell.com/support/drivers/us/en/19/ServiceTag/54ZNP4J
Please guys help me! D: