If anybody else had trouble to start up this game like me then here is what i did to fix it.
1) If steam remains stuck in preparing to launch. Make sure the game is installed on the same hard drive as steam. Usually the C drive.
2) If the game flickers. Go to your steamapps/common folder then safecracker2. In config AND STEAM_config files change bFullScreen=1 TO bFullScreen=0 and save.
3) I also had the game freeze on a black screen. To resolve this in my case i went to Nvidia control panel, manage 3d settings. Safecracker2 then manually turn Antialiasing mode to off. That solved all my issues and yes it was worth it.
I love games that put your brain to the test and Safecracker certainly did that!
The puzzles were varied enough to keep the whole experience interesting. It was nice having a subtle story behind it too, as it gave it more meaning. I would recommend this game to those who enjoy solving puzzles and feel rewarded when they finally crack a safe.
Took around 6 hours to complete and i found having a pen and paper handy helped :)