Microsoft HTML Object 4.0 library causing slowdown

Question

Hi,

I am trying to add the Microsoft HTML Object 4.0 library to my application.
Whenever I try to add it, C# hangs for about a minute and then adds it.

Each time I recompile my application with the reference to this library, it always takes about 2 minutes to compile despite there not been a lot of code.
I also get several warnings about the type library importer not being able to convert the signatures for some members.

Can anyone help?