I am on my Apple Imac desktop that is set up to sync with my other devices which include an old Windows laptop using Windows 8.1 Somehow everything on the windows laptop is gone, all my passwords and bookmarks, etc. and I want to set up the windows laptop to again sync with my main computer my Apple Imac. How do I do that? I know my password here to this forum but it must be a different password to sync my computers because entering my firefox account that I use to log in here doesn't work. I'm totally lost as to what happened to my laptop to wipe everything out.