SqlCe Exception : Operation is not supported on this platform.

I created a Setup of basic WPF application (By using SqlCe as backend) with login window, but when i open the connection with SqlCe DataBase to check the credentials getting this Exception:  "Operation is not supported on this platform."

SqlCeConnection conn = new SqlCeConnection(connectionString)
conn.Open();

I did some googling and went to MSDN to find out the solution and got that , SqlCe 4.0 is not supported in XP Service Pack 2 and Previous Versions, So why this problems is coming in 2 systems only. I checked the application in various system with window 7 it is working fine but only 2 systems (2 window 7 in which Visual Studio is not installed) this exception is coming. But in all system in which Visual studio is installed is working fine, while i am installing the application using setup.

Operation is not supported on this platform

at System.Data.SqlServerCe.SqlCeSHA256.Initialize()
   at System.Data.SqlServerCe.SqlCeSHA256..ctor()
   at System.Data.SqlServerCe.HashProvider.CalculateHash(String filePath)
   at System.Data.SqlServerCe.HashProvider.MatchHash(String filePath)
   at System.Data.SqlServerCe.NativeMethods.IsValidBinary(String filename)
   at System.Data.SqlServerCe.NativeMethods.ValidateNativeBinary(String modulePath)
   at System.Data.SqlServerCe.NativeMethods.LoadValidLibrary(String modulePath)
   at System.Data.SqlServerCe.NativeMethods.LoadNativeBinariesFromPrivateFolder(String privateInstall)
   at System.Data.SqlServerCe.NativeMethods.LoadNativeBinaries()
   at System.Data.SqlServerCe.SqlCeConnection..ctor()
   at System.Data.SqlServerCe.SqlCeConnection..ctor(String connectionString)
   at POP.Data.DBManager.AuthenticateLogin()
   at POP.Business.POPBusiness.AuthenticateLogin(UsersEntity obj)

 

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So, What setting or changes or fix i have to do for this problem ?????

Ashutosh Tiwari