Open Windows Explorer, browse to wherever you have Silent Hunter installed.
Look for a file named SH4.exe and RIGHT click on it.
Select Properties at the bottom of the menu that pops up.
In the Properties window, select the Version tab.
That will tell you what you actually have, and if you need a patch.
Other possibility - playing a game on a laptop with a built in sound chip instead of an actual sound card will cause weird effects for the game sounds, especially if it's an older chip that doesn't support stuff like hardware acceleration.
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