Hickory: Looking through your logs it looks like you may have a permissions issue, which brings us back to why I first asked you to check your antivirus. The first thing you should do is uninstall Galaxy, REBOOT, and then reinstall it OUTSIDE of the Windows protected 'Program Files' folder. NEVER install games or game related clients in 'Program Files'. Oh, and when troubleshooting issues while using Galaxy, be absolutely sure to turn off the in-game overlay.
Next, try quitting Galaxy completely and run the game directly from the <INSTALL LOCATION>\The Witcher 2\bin\witcher2.exe file, not the launcher.
Thank you, I've unistalled GOG Galaxy and reinstalled it under "C:\Games\" I'm actually redownloading The Witcher 2.I hope this is the right time.
If it helps, during the countless attempts I've run everything as Administrator (Launcher and GameExecutable), regarding the "Access Denied" that you've found in the logs I think that's depend by the new windows account(named TheWitcher) I've created to solve this problem. Also, before installing GOG Galaxy I was running the "offline" version of the Witcher 2 under "C:\GOG Games" also via witcher2.exe but again with the same result...
I'll update you as soon as I can, Thank you again