If you're experiencing freezing or hanging issues when trying to open QuickBooks, there are a few things you can try to troubleshoot the issue.

1. Check if there are any updates available for QuickBooks. Sometimes, outdated software can cause issues with freezing or hanging. You can check for updates by going to the Help menu and selecting Update QuickBooks Desktop.

2. Run QuickBooks in safe mode. This disables any add-ons or extensions that may be causing issues. To run QuickBooks in safe mode, right-click on the QuickBooks icon and select Run as administrator. Hold down the Ctrl key while opening QuickBooks.

3. Verify and rebuild your company file. This checks for any errors in your company file and rebuilds any damaged data. To do this, go to the File menu and select Utilities > Verify Data. If any issues are found, select Rebuild Data.

4. Disable antivirus or firewall software temporarily. Sometimes, antivirus or firewall software can interfere with QuickBooks and cause it to freeze or hang. Temporarily disable any antivirus or firewall software and see if the issue persists.

5. Create a new Windows user profile. Sometimes, issues with user profiles can cause QuickBooks to freeze or hang. Creating a new Windows user profile can help isolate the issue. To do this, go to the Control Panel and select User Accounts > Manage another account > Create a new account. Log into the new account and try opening QuickBooks.

6. Uninstall and reinstall QuickBooks. If none of the above solutions work, uninstalling and reinstalling QuickBooks can sometimes resolve the issue. Before uninstalling, make sure to back up your company file and any other important data.

If none of these solutions work, you may want to contact QuickBooks support for further assistance. They may be able to provide more advanced troubleshooting steps or identify any underlying issues with your system.