Is a COMException of 0x80040154 always 'Class not registered'?

Question

Does a System.Runtime.InteropServices.COMException of 0x80040154 always mean that the class isn\'t registered? I\'m getting a COMException which says \"Retrieving the COM c

Answer 1

Pay attention to register of 32-bit components using the correct register (C:\Windows\SysWOW64\regsvr32.exe).
If you have already registered up with the 64-bit version, unregister each dll with the same version.

More help you find here Team is Going from XP32 to XP64 for .NET Development - Any Gotchas?

Good luck