If your old PC is still working, go in to device manager and program&features, then delete or uninstall everything to do with the motherboard.
some chipsets will let you get away without re installing but some wont,they just bsod
idk what board your updating to? so far ive had no issue going from and z68 to z77,but I think x58 to z68 I had issue's
windows 7/8 usually sorts out the needed drivers for you ect