Picasa saves all the files to the hard drive. You can have many locations for pictures. It is possible the pictures are stored in a directory that is not being scanned continuously by Picasa. Since the files are on the hard drive, even the Picasa data for edits to the pictures are saved to the hard drive. So you could un-install the program and not lose the picture. You might lose the setup for what directories the program looks at. You can see the folders it uses to make the on screen thumbnails. Go to TOOLS -> FOLDER MANAGER. This is where you define the folders for Picasa.
If you imported the pictures from a camera using the import tool, the directory you specified is where the pictures are now. You also had the option to delete imported pictures, or not. If you try to IMPORT again from the main screen, look to the bottom left for the IMPORT TO: drop down and see where it is defaulting. Make sure that directory is being scanned in the folder manager.
Post again if this didn't help and add more information. As to where you were importing from and to. If the pictures still exist on the source, etc.
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