Can you manually insert an installation path, instead of using the browse button? Like: C:\Games\SilentHunter3 It should automatically generate the folders when it is installing.
Did you ever get the UAC to pop-up asking for permission? Most reports I found about this error suggested you need administrator priveledges to get past it. Which you really need, installing in Program Files or not. (By the way this goes for 32-bit as wel as 64-bit)
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