Your administrative rights are probably messed up, or something restricts the access to the game executables.
0xc0000005 means
"STATUS_ACCESS_VIOLATION".
▪ Did you try to right click on the game executables, and select "Run as administrator"?
▪ Did you try to temporary disable your antivirus and your firewall to see if they are blocking the access to the game executables?
▪ Did you try to use the
System Restore to restore your system to a previous date
(this does not affect your personal files)?
If it still doesn't work, you could try to restore the security settings to a known working state. To achieve this, do the following:
1) Open an elevated command prompt
(by right clicking on The "Command Prompt" icon and selecting "Run as administrator"). 2) Type the following command:
secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose If it sounds too complicated, there's a
<span class="bold">Microsoft Fix It application</span> <i>(50198)</i> that you can run. It's made by Microsoft and it supposedly does the same thing.
Good luck! ;-)
LinustheBold: Have you checked your system for malware and virus trouble? I would recommend using Malwarebytes Anti-Malware (MBAM): 
