When I open the QB desktop program I get a message. "Opps! QuckBooks has encountered an error and needs to close. Any unsaved work will be lost".

Hi Simon,

Welcome to the Community. It would be my pleasure to help you get to the bottom of this strange behavior going on when opening the QuickBooks program.

Let's first make sure to update the program to the latest release to ensure you can install any updates and maintenance releases.

Here's how:

1. Go to: https://downloads.quickbooks.com/app/qbdt/products.
2. Choose your country.
3. Select a product.
4. Choose your version.
5. Click Search.
6. .Click Download.
7. When the download completes, double-click to install the update (please note you may need to restart Windows after the installation finishes).

Once done, you can proceed with following the detailed instructions from the support link I recommend on this (scroll down to number 1 below See Update QuickBooks Desktop to the latest release:(

Resolve Problems Opening QuickBooks Desktop or your Company File.

If you're still having difficulty opening the program and the necessary troubleshooting won't work, I suggest reaching out to our Support Specialists this time.

Here's how you can reach them:

1. Open QuickBooks Desktop.
2. Click the Help tab at the top menu bar.
3. Click QuickBooks Desktop Help.
4. Click the Contact Us hyperlink.

Please touch base with me here for all of your QuickBooks needs, such as opening the program. The Community wants to ensure your success.