If you hae indeed been inactive for many years; I would strongly encourage you to go take a refresher course on your own to see if you are ready (and willing) to return to nursing today.
Nursing has changed dramatically over the past 5-10 years; just the way things are done electronically alone will be confusing to you. From charting to medication delivery systems, to how things are ordered and even delivered right now have all been affected by computerization.
Taking a refresher course will prepare you for some of these changes; it will also show prospective employers that you are serious about returning to nursing; and it could also make you aware why you left the nursing field in the first place.
I wish you luck and encouragement in returning to nursing!