Question

I have a project that was built in Visual Studio 2005 in C#. I created an installer for the Windows application (in VS2010) and it installs and works fine on Windows XP SP3. I tried installing it on Windows 7 32-bit and it says installation is successful but when I try to open the application I receive this error message:

A fatal error has occurred. Unable to load DLL ‘VistaDb20.dll’: Invalid
access to memory location. (Exception from HRESULT: 0x800703E6)

People suggested I run this in the command line:
regsvr32 VistaDb20.dll

I get the error message:

The module “VistaDb20.dll” was loaded but the
entry-point DllRegisterServer was not found.
Make sure that “VistaDb20.dll” is a valid DLL or OCX
file and then try again.

So then I tried regasm VistaDb20.dll /tlb:VistaDb20.tlb using the .NET Framework Assembly Registration Utility 2.0.50727.4927 and get error:

RegAsm : error RA0000 : Failed to load ‘VistaDb20.dll’ because it is not a valid .NET assembly.

I am not sure how to get my application running on Windows 7 with this .dll problem. Any help would be appreciated. This application and the database was created using VistaDB 2.1

I guess I can’t change the actual dll since I did not create it but maybe I have to change some properties of the dll in Visual Studio?

Answer 1

I had this error while trying to registering my VB .NET assembly using RegAsm command:

RegAsm : error RA0000 : Failed to load ‘VistaDb20.dll’ because it is not a valid .NET assembly.

I solved the problem buy executing RegAsm of the right .NET Framework.

I mean you should use the tools of the same Framework that you make as target in your advanced options of compilation (VS2010).