When I boot up a game, such as Fallout 4 or Overwatch they crash or freeze as soon as I press a key. Normally when I move the mouse around I'm completely fine, but as soon as I press any key the game freezes and normally crashes. I recently built a new PC and I've stress tested all of my parts for several hours and nothing seems wrong with the hardware. Sometimes when I boot up my computer (or restart) I can run the game flawlessly, but as soon as I close the program I cannot run any games. On top of that whenever I have the issue with the games, my Chrome browser will become unresponsive too. Without attempting to run the games Chrome runs fine, it only crashes after I have issues running a game. I doubt this issue is with the game itself because if one game doesn't work the other won't either, but if one game works the others will too... until I close out of the game. Any help would be really appreciated because I've tried almost everything I can think of and I'm not sure what to do at this point, thanks for your time.
Specs~
Intel Core i5-6600K 3.5GHz Quad-Core Processor (stock clock)
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Asus Z170-A ATX LGA1151 Motherboard
Kingston HyperX Fury Black 8GB (4 x 4GB) DDR4-2133 Memory
Samsung 850 EVO-Series 250GB 2.5" Solid State Drive
Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Sapphire Radeon RX 480 8GB Video Card (stock clock)
EVGA SuperNOVA P2 750W 80+ Platinum Certified Fully-Modular ATX Power Supply
Microsoft Windows 10 Home OEM 64-bit
Corsair K70 RGB Wired Gaming Keyboard
Logitech G502 Wired Optical Mouse
Edit 1: I forgot to mention that I don't receive any errors, the games just freeze and then become unresponsive. Also my temps are average/low and nothing is under full load when normally running these games. The Task Manager also seems to crash after I start having issues with games. It works fine before I have an issue running one of the games, but becomes unresponsive afterwards, much like Google Chrome, and can only be fixed via rebooting. The audio running for the games and Chrome keeps going as if there were no issues. Different games have different outcomes. For instance Overwatch will crash almost instantly, Fallout 4 will seemingly freeze and then I can move around with very, very low frames, and League of Legends will lag constantly, the frames are normally good, but the game feels like I'm running very low frames.
Specs~
Intel Core i5-6600K 3.5GHz Quad-Core Processor (stock clock)
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Asus Z170-A ATX LGA1151 Motherboard
Kingston HyperX Fury Black 8GB (4 x 4GB) DDR4-2133 Memory
Samsung 850 EVO-Series 250GB 2.5" Solid State Drive
Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Sapphire Radeon RX 480 8GB Video Card (stock clock)
EVGA SuperNOVA P2 750W 80+ Platinum Certified Fully-Modular ATX Power Supply
Microsoft Windows 10 Home OEM 64-bit
Corsair K70 RGB Wired Gaming Keyboard
Logitech G502 Wired Optical Mouse
Edit 1: I forgot to mention that I don't receive any errors, the games just freeze and then become unresponsive. Also my temps are average/low and nothing is under full load when normally running these games. The Task Manager also seems to crash after I start having issues with games. It works fine before I have an issue running one of the games, but becomes unresponsive afterwards, much like Google Chrome, and can only be fixed via rebooting. The audio running for the games and Chrome keeps going as if there were no issues. Different games have different outcomes. For instance Overwatch will crash almost instantly, Fallout 4 will seemingly freeze and then I can move around with very, very low frames, and League of Legends will lag constantly, the frames are normally good, but the game feels like I'm running very low frames.