Best way is to start with a cleansheet, a new Win7 version and only install these apps you need, I use the standard video drivers from Windows for instance, No need for special drivers.
It's pretty much for all music related pc's to install as less apps as you can.
I use Win7 64b Ultimate and goes like a spear even with all the options used in ST
Here you can see how to configure your Windows for optimum performance >
https://youtu.be/V6tB-2DeEvE
Helped me to configure all my workstations for music use.
Success