When I registered dao350.dll with regsvr32 and tried opening Visual Basic, it gave me an error: "Unexpected error; quitting"<BR><BR>I don't have the original installation disks, so I can't reinstall.

You probably need to declare area() as PASCAL calling convention and with the EXPORT macro so that it is, indeed, exported from your DLL. You'll also have to defeat C++ "name-mangling", so define it ...

This will re-register the concerned DLL file using the Windows OS tool regsvr32.exe. The Regsvr32 tool is a command-line utility that can be used for registering, and un-registering OLE controls as ...