Driver Signature Enforcement

I recently started having problems with my PC giving me a bluescreen every time I booted it, then entering a restart loop. I disabled driver signature enforcement, and then I was able to get into Windows after that. I then followed some advice to put these commands into Powershell(admin)...

What should I go for first for the future in upgrades? First to last. http://pcpartpicker.com/p/vLwX99 <--- current components. I want a fast really fast multitasking like switching between programs instant also id like fastest loading screens in games as possible. Either upgrade or whole new...