+1 for the clever ss uploading skills. (Sarcasm.)
~Do as Mr.Conquer said. USE THE WINDOWS 7 DK LAUNCHER. Just because your not on a windows 7 op, doesn't mean you wont have compatibility issues. I ran into this problem on windows server 2008 op myself.
~Rename your "DekaronServer_allchars.exe" to "DekaronServer.exe" and throw that win 7 launcher exe in with it. Always use the win 7 launcher. It stops most issues in their tracks.
EDIT: You're picture shows us otherwise. Your launching the dk server directly instead of using the win 7 loader.