What folder did you install the game in? You want to stay away from the Program Files directories. If you're on Windows 10 and have the recent updates, that may have trashed your video driver. In THEBERBSTER's signature is a link to SH4 Tutorials, and at the top of that page is
Total Black Screen > Sound No Picture > Picture No Sound Fixes. See if any of that can help you also.
If you install the game to a folder such as "C:\Ubisoft \ Silent Hunter Wolves of the Pacific", the SH4.exe file should be right in there, along with about 3 or 4 dozen other files and folders.