I had a similar problem with ACDSee 3.1 and found my solution on the ACDSee web site at:
http://acdsystems.cu...amp;p_topview=1-------------------------------------------------------------------------------------------------------
I pasted that page here:
Question
Why does ACDSee say "ACDSee has encountered an error and will now close"?
Answer
There may be an issue with the registry key that holds the settings for ACDSee.
Option 1 will remove the corrupt registry key which will delete the settings for ACDSee. In most cases, the issue will be resolved by completing the step in Option 1. If not, please continue with other options listed below
*Note: The following utility will remove your personal settings within the software, e.g. resetting ACDSee Browser/Viewer Layout, restoring all the default option under Tools | Options.
1. Click the following download link and saving the utility on your local hard disk, e.g. Desktop
ACD Systems Registry Key Remover.
2. Run the utility by double-clicking 'r_acdsee.exe' that you just have downloaded.
3. Restart ACDSee.
If ACDSee launches without an error message, it is recommended to optimize your database by following step in Option 2. If you cannot launch ACDSee, follow steps in Option 3.
OPTION 2: Remove thumbnails, optimize database tables & fields, and remove orphans
This procedure will NOT affect your image files or data
1. Click Database | Database Maintenance.
2. Click Remove Thumbnails.
3. In the Confirm Remove Thumbnails dialog box, click Yes.
4. Click Remove Orphan Folders if that button is available to you..
5. In the Confirm Remove Orphan Folders dialog box, click Yes.
6. Click Optimize Database.
7. On the Welcome page of the Optimize Database Wizard, click Next, select both options 'Optimize database tables and fields' and 'Remove orphans from database', then follow the wizard to optimize your database.
OPTION 3: If problem still persists, please delete all the CDX and two thumbnail files in the ACDSee database folder
1. With Windows explorer, navigate to ACDSee database folder. The location of the ACDSee database folder depends on the version and Operating System you are using. Look up the applicable folder in Knowledge Base 1342. For example, for ACDSee Pro 2.5 under Windows XP, the folder is located at 'C:\Documents and Settings\[yourusername]\Local Settings\Application Data\ACD Systems\25Pro\Default'
2. Within the 'Default' folder, sort the files according to file type in order to easily identify the CDX files
*Note : To sort the files according to their types, please try the following
1. In the Windows Explorer, choose View menu (XP), or click the View Button (Vista) and ensure 'Details' is selected.
2. Click Type Column.
3. All the files will now be sorted according to their file types.
3. Delete the 'CDX' files, and 'Thumb1.fpt', 'Thumb2.fpt'. Please note deleting thumb1.fpt and thumb2.fpt will result the loss of the contents of offline media.
4. Re-start ACDSee (and decline option to import old database if found).
OPTION 4: If problem remains, please remove existing database and create a new ACDSee database
Please note: The following procedure will result in a loss of any database information (Captions, Notes, Keywords, Ratings, Categories) entered into ACDSee since initial installation. The catalogued images (JPG, Tiff, PNG, etc,) and other media files (Audio, Video) will not be affected.
Close ACDSee before proceeding (including down by the clock).
1. With Windows explorer, navigate to ACDSee database folder. The location of the ACDSee database folder depends on the version and Operating System you are using. Look up the applicable folder in Knowledge Base 1342. For example, for ACDSee Pro 2.5 under Windows XP, the folder is located at 'C:\Documents and Settings\[yourusername]\Local Settings\Application Data\ACD Systems\25Pro\Default'
2. Delete all the files in that 'Default' folder.
3. Re-start ACDSee (and decline option to import old database if found).
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I tried Option 4 and deleted the ACDSee data bases located in C:\ProgramData\ACD Systems\ACDSee\ImageDB.ddf and ImageDB.dtf
When ACDSee restarted, it wrote new data base files and the program works again!
Hal