I have been playing this games for around two weeks, every time I play some error shows up. Following I list more recurrent errors:

-UnityPlayer.dll caused an Access Violation (0xc0000005) in module UnityPlayer.dll
-nvwgf2umx.dll caused an Access Violation (0xc0000005) in module nvwgf2umx.dll
-RHQ.exe caused an Access Violation (0xc0000005) in module RHQ.exe

One of the above errors appears and I can't reach Mafia Boss mission day.