My TomTom appears to have been affected by the GPS Week Rollover Week, I understand that 6 April 2019 was the critical date. I looked on the TomTom website, input the serial number, to be informed I need to upgrade, and for my PC system, had a choice of Windows XP or Vista, or OS Mac. - Windows 10 not included. I thought, has any one else had similar issues? I think it may still work, but without correct time, therefore the distance left to drive and ETA, etc. will not be shown.