What OS Should I Run On This

[forwardyt22]

CPU: AMD A4 6320
RAM: 4GB 1333Mhz DDR3
MOBO: MSI Mainboard FM2-A55M-P-E33
Storage: 80GB
GPU: GTX 750Ti
PSU: Master Cooler 400w 80+ Certified
Case: CiT Green LED case MICRO ATX

Resolution i should run and OS

 

[Dark Lord of Tech]

Wndows 10 64bit if your board has all the drivers available.
https://www.microsoft.com/en-us/software-download/windows10
Windows 10 download tool ^

 

[WildCard999]

Anything between Win7 to Win10 should work fine for that PC and as far as a resolution if your gaming I would think anything from 720P to 1080P would be ok as long as you don't mind turning down the settings a bit.