Even though the error states that your database is not corrupted, it sounds like it is. Here's how to fix it (courtesy of www.powershot.com
):
If it is still running, Exit ZoomBrowser EX.
Use Windows Explorer to delete the following three files: xxx.dat, xxx.idx, and xxx.zbd (where xxx is the name of the database, usually 'My Database'). Usually, these three files will be found in the C:\Program Files\Canon\ZoomBrowser EX\Database folder.
If you find any files in this folder with an ".fcs" extension, such as D0000000.fcs, delete these files also.
Start ZoomBrowser EX again. If you receive a message advising you that the database has been deleted, click [OK]. On occasion, you may have to allow ZoomBrowser EX to close itself. Restart the program again. Also, if an 'Open Database' dialog box appears, click [Cancel] to close it.
From the File menu, select Database, then New.
When a 'multiple databases' warning message appears, click [OK].
Navigate to the location where you want to save the database (C:\Program Files\Canon\ZoomBrowser EX\Database folder), then type in the desired name of the new database (call it My Database) and click [Save].
When you receive a message to identify an image library with your new database, click [Add image library now].
Navigate to the folder which contains your images. If you are using the default installed settings, this will be C:\Program Files\Canon\ZoomBrowserEX\Image Library One. With this folder highlighted, click [OK]. Be very careful that you do not select the wrong folder. That should do it.