Every week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.

Ever since the Microsoft Office (Word and Excel) licence expired on my home computer, I get annoying pop-ups asking me to subscribe at £7.99 a month. I’m only a casual user. What are the best cheap alternatives? I’ve seen some completely free ones – but are they safe to use?

Do you have a problem readers could solve? Email your suggestions tomoney@theguardian.com or write to us at Money, The Guardian, Kings Place, 90 York Way, London N1 9GU