Hi,
I'm not really sure if there is a proper way to install system drivers but I have found a method that works well for me.
I normally check to see if there are new Mobo drivers available before I build a rig so I have them at hand after I have installed the OS as the disk that comes with the Mobo can often be out of date. I also avoid using the Gigabyte Install Disk as I prefer to have full control over the items I am installing and, to be blunt, I don't really like much of the Gigabyte Software. If I do use the Gigabyte Disk I only install the essential drivers and I never let the software take control of the install.
Once I have the OS installed I.....
Install Mobo Drivers (reboot after each one Chipset, Ethernet, Etc.)
Install Graphics Drivers (if I have an add-on card) (reboot)
Install Sound Drivers (If I have added Sound Card) (reboot)
Install any other drivers needed. (Normally I check in Device Manager to see if anything else is required)
Download and install any updates that the system wants.
Once I have the basics running OK I then install Apps and other software as needed etc.
Hope this helps.