If it's the Steam version you probably will not be able to run it outside of the Steam Folder installation
If you installed Steam into Program Files, that can be an issue. If you did that, Uninstall Steam (I know that sucks), and reinstall it and choose to install Steam in its own directory C:\Steam works just fine.
Then redownload your Steam stuff... Silent Hunter, etc
99% of the game issues of Steam users is due to allowing Steam to install itself in Program Files. All the following game installs then suffer from this Microsoft Program Files stupidity and not Steam itself.
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