We have two PCs - mine is running windows 10 and my wife's is running Windows 7. I haven't had any problems with Win 10 but I don't run many applications other than Chrome and gmail. Poker Stars works perfectly as does my scanner & printer. We have kept my wife's system on Windows 7 because she is running an access application for managing her Antique Inventory that uses a very old version of Access. The Open Office suite works well too on both versions. I am really happy with the built in security in Win 10 - the updates are done automatically so its always up to date. I must admit though - I missed the "Start Button" at first.