[web] Domain controller &ASP.NET

Hi! I have an ASP.NET project that uses a WebService to connect to the SQL database.Everything was setted right,in terms of UserInterfacePermissions(to use dialog pop-up windows)and WebPermissions.The application worked fine until i installed a domain controller with windows authentification on the server. I get the following error message: "server was unable to process the request -->>File or assembly name lsb-6i9h.dll or one of its dependencies was not found ..The same goes with bd670h-r.dll" and anytime i try to process the request i get other dll names....This looks strange ...i really don't know why i get this permission constraints and missing dlls Thx !