(Note: I thought about posting this to serverfault, but I figured more developers have banged their heads against these issues than admins)
I'm trying to set up a web page that uses both ASP Classic and ASP.NET 2.0 in the environment mentioned above. After applying many common fixes on the web and a few lucky guesses, the ASP.NET 2.0 pages are finally running fine (Minus COM+). The ASP Classic pages aren't running at all.
So I'm thinking the x64 environment is a the cause of most of my problems. Is there anyone here using old COM+ stuff with ASP Classic and ASP.NET in x64 and IIS7 with some words of wisdom?
You need to set the application pool to 32 bit mode ("Enable 32-bit Applications" in advanced properties). Set anonymous user permissions correctly. More IIS7 ASP material from learn.iis.net.