Can't seem to setup multiple WordPress DB's

I’ve already had to reinstall Xamp once already. I keep messing up somewhere when adding the new lines to the server config files in Apache. Seems like it should be a breeze but when I’m done Apache won’t run at all. After the first reinstall I smartened up and made copies of the files which I’ve had to use twice now. I have no idea where I’m going wrong. When I save the files I save them in notepad as .cfg under “Save as al Files” or whatever it is.

Is there anyway to build this persons blog locally sharing my current DB and then transfer the blog to the friend I’m building it for? Any other ideas? Thanks!