Error: "Class does not support Automation..."

I am getting an error "Class does not support Automation or does not support expected interface".

Here are the circumstances:
Operating system:
Client: Win2K or WinXP Pro (error occurs on either)
Server: Win2K (SP4)
Application:
IIS 5 (web server)
Custom COM+ Object (built with VB 6.0 SP5)
SQL Server 2000 (SP3)

Last week, I installed VB .NET onto my notebook. Today, I was looking through the code for my custom COM+ object and decided to tweak it slightly: mostly adding Option Explicit where it had been left out. After recompiling it and installing it onto the web server, I began getting the error shown above.

When I restore a previous version of the .DLL, I do not get the error.

Google searches tell me that the problem is with my MDAC. The VB 6 project file references MDAC 2.6. I reinstalled MDAC 2.6 with no success. I reinstalled MDAC 2.7 (which was installed when SQL 2000 SP3 was installed) and still no luck. I have rebooted the server.

Any help here would be greatly appreciated.

Regards,

hmscott

Someone in another forum pointed out that I had to check the option to "maintain binary compatibility". That seems to have done the trick.

Regards,

hmscott

this is the conflict of new and older version.
check the dll configuratio about that