If you're not Boosting or Glitching then see -> Activision Support However, to my understanding this corruption issue has been resolved a long time ago. Also see the reasons for a Reset -> Call of Duty: Black Ops II - Security & Enforcement Policy
Otherwise, in most situations or problems running the game first start with Game Cache Integrity (GCF) scan which resolves most issues. Next, if Steam is crashing then reinstall Steam, if the game is crashing reinstall the game, and verify that your PC meets or exceeds the minimum requirements.
okay the game does the same thing but i will contact support and see if they can help me more.