So I downloaded Crysis 2 and when I push play the computer starts working and after few seconds goes silent again and crysis 2 does not start, does anyone know how to fix it?

This is my log file

BackupNameAttachment=" Build(0) 10 Sep 12 (23 29 22)" -- used by backup system
Log Started at 09/10/12 23:29:22
Running 32 bit version
Executable: C:\Program Files (x86)\Steam\steamapps\common\Crysis 2 Game of the Year\bin32\Crysis2.exe
FileVersion: 1.9.0.0
ProductVersion: 1.9.0.0
Using STLport C++ Standard Library implementation
Added MOD directory to CryPak
Executable Command Line: "C:\Program Files (x86)\Steam\steamapps\common\Crysis 2 Game of the Year\bin32\Crysis2.exe"

Total number of logical processors: 8
Number of available logical processors: 8
Total number of system cores: 4
Number of cores available to process: 4

Processor 0:
CPU: Intel Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Family: 6, Model: 10, Stepping: 7
FPU: On-Chip
CPU Speed (estimated): 1995.5 MHz
MMX: not present
SSE: present
3DNow!: not present
Serial number not present or disabled

Processor 1:
CPU: Intel Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Family: 6, Model: 10, Stepping: 7
FPU: On-Chip
CPU Speed (estimated): 1995.5 MHz
MMX: not present
SSE: present
3DNow!: not present
Serial number not present or disabled

Processor 2:
CPU: Intel Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Family: 6, Model: 10, Stepping: 7
FPU: On-Chip
CPU Speed (estimated): 1995.5 MHz
MMX: not present
SSE: present
3DNow!: not present
Serial number not present or disabled

Processor 3:
CPU: Intel Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Family: 6, Model: 10, Stepping: 7
FPU: On-Chip
CPU Speed (estimated): 1995.5 MHz
MMX: not present
SSE: present
3DNow!: not present
Serial number not present or disabled

[Warning] Unknown command: sys_game_folder
[Warning] Unknown command: sys_dll_game
[Warning] Unknown command: sys_user_folder
[Warning] Unknown command: r_ShaderCompilerServer
[Warning] Unknown command: log_IncludeTime
[Warning] Unknown command: log_verbosity
[Warning] Unknown command: sys_PakLogInvalidFileAccess
[Warning] Unknown command: sys_float_exceptions
[Error] Error: ConsoleVariableGroup 'sys_spec_objectdetail' key 'e_DecalsForceDeferred' is not missing in default
[Error] Error: ConsoleVariableGroup 'sys_spec_objectdetail' key 'r_DrawNearZRange' is not missing in default
Windows 7 64 bit SP 1 (build 6.1.7601)
System language: Lithuanian
Windows Directory: "C:\Windows"
Prerequisites...
* Installation of KB940105 hotfix required: no! (either not needed or already installed)
Local time is 23:29:23 09/10/12, system running for 55 minutes
8087MB physical memory installed, 5268MB available, 4095MB virtual memory installed, 34 percent of memory in use
PageFile usage: 82MB, Working Set: 66MB, Peak PageFile usage: 83MB,
Current display mode is 1600x900x32, (Unknown graphics card)
Japanese keyboard and 5+ button mouse installed
--------------------------------------------------------------------------------
[Warning] Unknown command: sys_game_folder
[Warning] Unknown command: sys_dll_game
[Warning] Unknown command: sys_user_folder
[Warning] Unknown command: r_ShaderCompilerServer
[Warning] Unknown command: log_IncludeTime
[Warning] Unknown command: log_verbosity
[Warning] Unknown command: sys_PakLogInvalidFileAccess
[Warning] Unknown command: sys_float_exceptions