Getting "ActiveX controls could not be instantiated. Reinstall or register the controls and try again" message when viewing Dialog

I have an 开发者_StackOverflow中文版existing Visual C++ project using MFC that I'm running within Visual Studio 2008. The machine was just setup and installed and I have pulled the project from Source Control. The solution builds ok, but if I go into the resource file and try to pull up and view a dialog, I get the message

2 ActiveX controls could not be instantiated. Reinstall or register the controls and try again message when viewing Dialog

I'm not sure how to determine which ActiveX controls it is complaining about so I can try to re-register them since it will not display the dialog.

I am able to create a new Dialog and place controls on it, but the existing ones will not pull up.

Look in the .rc file of your project with a text editor. You'll see something like this:

CONTROL "",IDC_MUMBLE,"{CA8A9780-280D-11CF-A24D-444553540000}",WS_TABSTOP,58,46,130,48

Note the GUID in braces. Fire up regedit.exe on your old machine and navigate to HKCR\CLSID\{guid}. There will be enough hints there to find the component you need install. The InprocServer32 key points to the DLL.