First of all, I want to warn you that Rosewill PSUs utilize very cheap materials. It is not uncommon to get a bad PSU from them that will die suddenly or cause instability not long into their life. Do not skimp on the power supply, as it is the most crucial element in a PC for stability. Save up for a
high end model of some reliable brand names. Good article to read up is
here as well as
here for a database. Avoid economy versions of any brand, as they most likely have just as cheap of components as Rosewill does.
Anyways, whether it was actually causing your problems or not, Driver Verifier was catching the Gigabyte EasySaver driver doing something funky. Motherboard utilities and software are gimmicky and buggy, and are prone to causing BSODs and other symptoms. It's best to do a cleanup of all of them, leaving only
drivers that are
specifically designed to provide functionality to a component (e.g. LAN drivers for LAN, audio drivers for audio, etc.). Any driver that is designed to give a "boost" or some other improvement should be avoided. You may need to use something like CCLeaner or Driver Fusion (both free) to entirely remove all this software, since often even their uninstallers are buggy and leave stuff behind.
Once that's all done, test for stability. If it's ok, congrats, otherwise turn Driver Verifier on again, restart, let it crash and send crashdumps.
Oh, and it goes without saying, if you have any overclocking going on, reset to factory defaults. In fact, check your BIOS settings and set to
safe defaults, since often mobos will have normal presets that are actually slightly overclocked. Of course, it also goes without saying to update your BIOS.