Man, M$ sure likes to hide their numbers. I'm assuming you downloaded through the Microsoft store, if that's the case, you have to call them with product key issues. The number is 1-877-696-7786
Thanks for that. I'm in Scotland and really can't afford a phone call to the States however I have been given a UK phone number which I'll try tomorrow and hopefully it will solve my problem. Meantime, thanks for your continuing interest and help. Helen E.
By default, it's Microsoft Tech Support, but there's a link on the top (below the ACTION: Red text, to the right) to send an email to the Microsoft Store support team.
Thanks again for your continued assistance. I telephoned Microsoft this morning and they have reinstalled the programme on my laptop. Very grateful for all the interest I've received regarding this problem. Helen E.