If you have been using Picasa for a while you have probably noticed that it scans your computer every time you add new pictures. Depending on how many pictures you have added, Picasa takes some time until you can access and modify the new pictures in Picasa. I have recently received a question from a reader asking if he has to reinstall Picasa if he changes the entire folder structure of his pictures collection. The answer is very simple, so read on to find out.