Computer freezes and I am no genius with this

Graphics Card:

AMD Radeon (TM) RX 480 or 8192MB ATI AMD Radeon RX 480 (ATI)



Desktop System:




Operating System:

Windows 10 64bit



Driver Version:

Radeon Software Crimson ReLive Edition 17.2.1



Display Devices:

LG IPS HD Monitor Black 24MP57HQ (1920x1080@60hz)




Gigabyte Technology Co. Ltd. 990FXA-UD3 (CPU 1)



  AMD FX-9590

  Vishera 32nm Technology



Power Supply Unit:

Thermaltake Smart 750W 80Plus Bronze




16.0GB Dual-Channel DDR3 @ 803MHz (11-11-11-28)



Computer freezes from time to time since I got this graphics card. Activities on the computer that would freeze it would be video editing or playing League of Legends. Browsing facebook or the internet does not make it freeze unless multiple programs are running all at once.



When playing League of Legends, it freezes 1-2mins after the game starts and sometimes when it is still on the loading screen.



I am a noob in terms of this, so please dumb it down for me I really need help and my computer is driving me nuts.