Jill,
First, you don't need to know anything at all about Access except how to click on it.
It's hard to tell from your question exactly what old meds are popping up. Are you saying the meds you took out of Access are still there? Are you saying that the medications are still listed in the prescription writer of the patient? Or are you saying that when you type a few letters in the script writer, that an old medication comes up. These are all different things, and I wasn't able to ascertain which one you were referring to.
As far as the second one, (meds staying in the script writer) they would, and I am sure you know that. As for the last one, the medications which autopopulate the script writer, i.e. you type Amo and up pops Amoxicillin suspension 250 mg/5mL etc. comes up that is due to your registry. In other words, your registry on EACH computer remembers the last 100 or so prescriptions. It's easy to change, but you really don't need to or want to. Now, if you are talking about the first one, if you delete medications from Access or add them and just save it, they will not be gone or be there. You have to delete a couple of tables first. It isn't complicated, but if you don't know how to do it, then you won't be successful.
Post back, and either Brian or I can help you. Brian's complete list will work perfectly for you.