any idea how to add multiamedia audio controller without the resource cd?

Question

have a dell dimension 4600

Answer 1

What you need is called a driver.

You can download the driver from dell support site. Find your service tag as there are 4 different controllers it could be for the 4600, without the service tag we can't know which one you need with out opening the case or doing some more advanced analysis.

dell support site
http://support.euro.dell.com/support/downloads/index.aspx?c=uk&l=en&cs=&s=gen