Cant reactivate my serial..........

Anybody know how I can reactivate my serial?  I reformatted my system(its a thing I do every 4 months) and when I tried entering my serial it said it was unseccessful.  I have about 400+ days left.  Are they gone or is there a way to get it back?  I dont remember my nortorn account or what email or password I used, so thats out of the question.  Is there anything else I can do or am I stuck looking for a new IS?