I have uninstalled and reinstalled and tried repairing, reorganizing the catalog but nothing seems to work.
Here are troubleshooting suggestions by John R Ellis :
I can start PSE but when I start the organizer I get the error once the organizer opens.
You haven't said how are you starting the PSE? There are many ways, of course, but the two main methods are:
1) clicking on the desktop icon
2) Start/Windows Logo >> All Programs > Adobe Photoshop Elements
Now I suggest use the second method and then go into Edit first. Once you are in Edit, click on the Organizer icon on the top right corner.
This should start the organizer. Hopefully this would fix it forever when you exit from the PSE because the settings are normally saved on exit.
The above is an adaptation of this thread:
If you can't "start the Organizer", how were you able to "repair and reorganize" the catalog?
You still have to explain, in excruciating detail, exactly what you're doing and have done.
Also tell us what operating system you're using.