I would guess that the person who sorted out your computer cleaned out everything in its memory. i.e. deleted all the previous cookie information etc, This would delete all the information that you previously entered on the sites that you visited.therefore the next time you visit one of your favourites sites you would have to to re enter your info. With regards to having to enter details more that once ensure that you tick the box that says something like " keep information" if this is what you want them to do , (not advisable though ) remember the less info you put on a computer the safer it is for you.