Hi !
This Way is easy and secure !
1.Download EasyCleaner(Freeware)
http://www.mediafire.com/download.php?vytds6ttwuf
2.Extract Archive and start EasyCleaner(no Installation)
3.Select Your Language
4.Hit Add/Remove
5.Find Silent Hunter 4 and hit Uninstall
5.If Silent Hunter 4 has been removed,hit Delete
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FINISH
Now You can Install Silent Hunter 4 again.
This Program also Helps You to clean Your System.I use it for myself since 2 Years without Problems,
Regards
Rolf