Visual Studio is compiling Asp.Net to 4.0, but I need it to compile to 3.5. Where do I change this?
According to this (right click project, property pages, build) it is targeting 3.5, but I’m fairly certain based on the errors I’m getting with install that it’s requiring 4.0 components.

Have you checked the
<compilation>section of the Web.config file? If it still readstargetFramework="4.0"try removing/changing this value. This has worked for me in the past.