Game randomly crashes

[AvalonOfThePlains]

I downloaded the game and launched and everything went fine I instantly loved it but then I black screened at the menu and windows popped up “Dirty Bomb has stopped working” and so I relaunched and it played for about 3 minutes perfect then mid game crashed so I try’ed again and this time as soon as I loaded into a server I crashed. My pc specs are Processor: AMD Fx 8320 Eight core processor 3.5GHz
Installed memory(RAM):4.00 GB
System type: 64 Bit Operating system
Graphics card: Nvidia 630
Please help I really wanna play this game its so fun from just the few minutes I played. Greatly appriciated