Kan inte starta Serious Sam 3

Vet inte riktigt vart jag ska lägga denna men detta är då problemet : Har nyss köpt serious sam 3 till steam och när jag ska starta upp spelet kommer "'Cannot open file Content/SeriousSam3/Levels/Menu/Intro.tex" upp Är mycket tacksam för hjälp ///Themattias

Detta är loggen från Serious Sam 3 :

-------- START OF LOG --------

00:32:33 LOG: Core version: $Version: distro_Sam3_PC; SeriousSam3-Windows-Final; 171822 2012-10-30 12:02:14 @builder05; Win32-Static-Final-Unrestricted$
00:32:33 LOG: Command: $
00:32:33 LOG: Initializing timer.
00:32:33 LOG: Timestamp: 2012/11/25 00:32:33
00:32:33 LOG: Binary name: Sam3_Unrestricted.exe
00:32:33 LOG: Binary soft path: Bin/
00:32:33 LOG: Binary hard path: C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\
00:32:33 LOG: Application directory: C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\
00:32:33 LOG: * OS...
00:32:33 LOG: Name: Windows 7
00:32:33 LOG: Kernel: WinNT (64-bit)
00:32:33 LOG: Version: 6.1, build 7600
00:32:33 LOG:
00:32:33 LOG: * CPU...
00:32:33 LOG: Vendor: AuthenticAMD
00:32:33 LOG: Type: 0, Family: 15, Model: 1, Stepping: 2
00:32:33 LOG: Clock: 4.19 GHz
00:32:33 LOG: Cores: 4
00:32:33 LOG: CMOV: Yes
00:32:33 LOG: SSE: Yes
00:32:33 LOG:
00:32:33 LOG: * Memory...
00:32:33 LOG: Total physical memory: 12267 MB
00:32:33 LOG: Free physical memory: 8747 MB
00:32:33 LOG:
00:32:33 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\ScriptLua.dll".
00:32:33 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\GameEnv_Steam.dll".
00:32:33 INF: GameEnv API: Steam
00:32:33 INF: Encoded user ID = 0818c190:4d78fdd0
00:32:33 LOG: Error getting mixer source line info for microphone. Will not be able to control microphone.
00:32:33 LOG: Created thread 4580(ResourceLoader).
00:32:33 LOG: "$C:/Program Files (x86)/New Folder/userdata/37168240/41070/local/SeriousSam3.ini" does not exist, skipping cvar loading.
00:32:33 LOG: Trying to set display mode 1280x1024(fullscreen)...
00:32:33 INF:
00:32:33 INF: * Desktop settings...
00:32:33 INF: Color depth: 32-bit
00:32:33 INF: Desktop resolution: 1280 x 1024
00:32:33 INF: Virtual screen: 1280 x 1024
00:32:33 INF: Monitors attached: 1
00:32:33 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\GfxD3D.dll".
00:32:33 LOG: Loaded "D3D9.dll".
00:32:33 LOG: Loaded "D3DCompiler_43.dll".
00:32:33 LOG: Loaded "D3DX9_43.dll".
00:32:33 LOG: Loaded "ATIADLXY.DLL".
00:32:34 INF:
00:32:34 INF: Gfx API: Direct3D
00:32:34 INF: Resolution: 1280 x 1024
00:32:34 INF: Vendor: ATI (0x1002)
00:32:34 INF: Driver: aticfx32.dll (0x6738)
00:32:34 INF: Renderer: AMD Radeon HD 6800 Series
00:32:34 INF: Version: 8.17.10.1119
00:32:34 INF: Video memory size: 1024 MB
00:32:34 INF: Available for textures: 2771 MB
00:32:34 INF: Active GPU(s): 1
00:32:34 LOG: Processing file Content/SeriousSam3/Config/CheckDriver.lua
00:32:34 INF: Driver version: 1119 (required: 1100)
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\SfxXAD.dll".
00:32:34 LOG: Loaded "X3DAudio1_7.dll".
00:32:34 INF:
00:32:34 INF: Sfx API: XAudio2
00:32:34 INF: Device: Hgtalare (Realtek High Definition Audio)
00:32:34 INF: Mixer frequency: 48000 Hz
00:32:34 INF: Mixer voices: 2
00:32:34 INF: Max sound sources: 25
00:32:34 INF: Max total volume: 3
00:32:34 INF: Speaker config: stereo
00:32:34 INF: Environment FX: enabled
00:32:34 INF: Current environment: Padded cell
00:32:34 INF:
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\SeriousSam3_Project.dll".
00:32:34 LOG: Content/SeriousSam3/All_01.gro: 6414 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_02.gro: 5133 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_145562.gro: 2565 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_147686.gro: 835 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_150406.gro: 627 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_170136.gro: 703 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/All_171822.gro: 94 files, signature: OFFICIAL
00:32:34 LOG: Content/SeriousSam3/CachedShaders_PC.gro: 4277 files, signature: OFFICIAL
00:32:34 LOG: Loading translation tables from Content/SeriousSam3/Locales/enu/.
00:32:34 LOG: Content/SeriousSam3/Locales/enu/translation.tbl
00:32:34 LOG: Content/SeriousSam3/Locales/enu/translation_All.tbl
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\CodecAudio_Vorbis.dll".
00:32:34 LOG: Module 'Bin/CodecAudio_Vorbis.module' loaded in '0.00' seconds.
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\CodecVideo_Null.dll".
00:32:34 LOG: Module 'Bin/CodecVideo_Null.module' loaded in '0.00' seconds.
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\Input.dll".
00:32:34 LOG: Loaded "xinput1_3.dll".
00:32:34 LOG: Module 'Bin/Input.module' loaded in '0.01' seconds.
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\Game.dll".
00:32:34 LOG: Module 'Bin/Game.module' loaded in '0.00' seconds.
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\ProcRender.dll".
00:32:34 LOG: Loaded "C:\Program Files (x86)\New Folder\steamapps\common\Serious Sam 3\Bin\Shaders.dll".
00:32:34 LOG: Module 'Bin/Shaders.module' loaded in '0.01' seconds.
00:32:34 LOG: Module 'Bin/ProcRender.module' loaded in '0.01' seconds.
00:32:34 LOG: Module 'Bin/Shaders.module' loaded in '0.00' seconds.
00:32:34 LOG: Alienware LightFX is not installed.
00:32:34 LOG: Module 'Bin/SeriousSam3_Project.module' loaded in '0.71' seconds.
00:32:34 LOG: Processing file Content/SeriousSam3/Config/autoexec.cfg
00:32:34 LOG: Created thread 1332(GameDataJobs).
00:32:34 LOG: cvarShowDiffs()
00:32:34 LOG: gfx_bLastGoodFullScreen = 1 (0)
00:32:34 LOG: gfx_pixLastGoodResHeight = 1024 (480)
00:32:34 LOG: gfx_pixLastGoodResWidth = 1280 (640)
00:32:34 LOG: gfx_pixResHeight = 1024 (0)
00:32:34 LOG: gfx_pixResWidth = 1280 (0)
00:32:34 LOG: snd_fVoiceCommVolume = 0.7 (1)
00:32:34 LOG: Processing file Content/SeriousSam3/Config/AutoDetect.lua
00:32:34 INF: AutoDetect: No previous hardware values stored, adjusting settings automatically.
00:32:34 INF: CPU efficiency: 3771.9 MHz * 4 cores = 9052.56 Mhz
00:32:34 INF: ID: 0x6738; card: Radeon HD 6800 series; quality: 4
00:32:35 LOG: 0 textures reloaded in 0.4 seconds
00:32:36 LOG: 217 shaders reloaded in 1.5 seconds
00:32:36 INF: AutoDetect: storing new settings: gfx_iPixelProgramVersion=40,gfx_ctConcurrentGPUs=1 ,sys_iGPUVendorID=4098,sys_iCPUFamily=15,sys_iCPUM Hz=4191,sys_iGPUDeviceID=26424,sys_strCPUVendor=Au thenticAMD,gfx_ulVideoMemoryMB=1024,
00:32:36 LOG: Created thread 5652(SyncWorkshop).
00:32:37 LOG: Steam workshop sync operation finished in 0.92 seconds.
00:32:49 ERR: File signature verification failed. (content/serioussam3/all_145562.gro)
00:32:51 ERR: File signature verification failed. (content/serioussam3/all_145562.gro)
00:32:51 FTL: Cannot load 'Content/SeriousSam3/Levels/Menu/Intro.wld': File signature verification failed. (content/serioussam3/all_145562.gro)