OK, a few things:
As Brian said, I always suggestion simply renaming the origianl (bad) one from AmazingMeds.mdb (where it is functional) and renaming it to AmazingMeds.old or anything else -- it doesn't matter. Technically, you could call it AmazingMeds.IDoNotLikeThisFile. Windows will still warn you it won't work and, after you click OK, it will turn into a non-useable file. It will still contain all the original data, and it will be the same size.
Then you put the new one it. If you were to be the new one in without renaming the old one, Windows will warn you that there is a file with the same name, and you would overwrite it.
Again, as long as the file isn't in the database with the .mdb extension, you would be OK. I think philosophically it is good to understand that you could just as easily move the file to your desktop or delete it altogether. I have always recommended renaming it instead simply because it is comforting (for lack of a better word) to know that the original database is still there.
As to how to do it, I will take you step by step with screen shots to make it easy.
