The following window is what will appear after you enter in a serial or decide to try the software. You have two options for Picasa to take:
1) Picasa will search all drives for photos and graphics
2) You will be taken to a screen where you select what areas are to be scanned by Picasa
I chose #2 because I have a massive amount of graphics and photos on my computer (including 3 hard drives), and I wanted the option to add certain folders to Picasa, at my convenience. Now, if you want your entire hard drive to be mapped out by Picasa, and want everything categorized, then by all means do it. However, do remember that everything will be scanned.
When you choose the option of selecting your own areas on your computer to be scanned, you will see this window. All computer hard drives (including My Pictures and Desktop) are set to be scanned originally, so it is up to you to click on the appropriate drive/area and choose one of 3 options displayed:
1) Scan Once
2) Do Not Scan
3) Watch For Changes
Since I do NOT want all drives or areas to be scanned in this particular case, I click on "Desktop", select "Do Not Scan", and do the same for "My Pictures" and my 3 hard drives. As you can see below, everything has a Red X beside it.