Sudden Drop in FPS and memoey can not be written error then crash

[st3a1th 0]

Hello

 

I keep getting a sudden drop in FPS, memory can not be written message and the game crashes. The Instruction at xxxxxxxxxx be forced memory at xxxxxxxxxxxx memory could not be written. I also get onf of those message to say I missing a file while playing the campaign. Though I have reinstalled and verified all files  

 

I have steam version

 

AMD Phenom II x4 965 3.4g Processor

4gb Ram

32bit operating system

GeForce GTX 960 4gb graphic card 

500gb SDD Hard drive

Windows 8.1

 

I have done a memory test and memory is ok, I have also do a scan disk etc and all is fine

 

Thanks

[ineptaphid 6410]

Are you running any mods? And have you verified the integrity of the game cache?

[st3a1th 0]

No mods and I have verified the integrity yes.