You can download the drivers on another PC
and copy them to a flash drive, then install them on the old PC, if that's what you need. It's not clear to me what you're trying to get from the resource CD. If it's drivers, just go to the Dell website, click Support, put in the service tag, and download them. If it's programs, if you have the resource CD that matches the computer, I don't know of any reason that wouldn't work. They do check though to make sure they match, so I'm wondering if maybe that's why you're getting the error(s).