QuickBooks Error 15222 usually occurs during payroll or software updates and is often linked to issues with internet connection settings or anti-virus software blocking the update. Here’s how you can resolve it:

1. Verify Internet Explorer Settings:

   • Ensure that Internet Explorer is set as your default browser, as QuickBooks uses its settings to access the internet.
   • Check the date and time settings on your computer. Incorrect settings can cause update errors.

2. Update Digital Signature Certificate:

   • Navigate to C:\Program Files (x86)\Intuit\QuickBooks (or the relevant directory for your installation).
   • Locate the QBW32.exe file, right-click it, and select “Properties.”
   • Under the "Digital Signatures" tab, ensure "Intuit Inc." is selected, then click on “Details” followed by “View Certificate.”
   • Click on “Install Certificate” and follow the prompts to complete the installation. Restart your computer after installation.

3. Check Your Anti-virus and Anti-spyware Settings:

   • Anti-virus software, anti-spyware programs, or firewalls might be blocking QuickBooks updates. Make sure to add QuickBooks as an exception in these programs or temporarily disable them during the update process.

4. Update QuickBooks Desktop:

   • Sometimes, manually updating QuickBooks Desktop to the latest version can resolve the issue. Go to the “Help” menu and select “Update QuickBooks Desktop.”

By following these steps, you should be able to fix QuickBooks Error 15222 and resume normal operations. If the problem persists, consider contacting QuickBooks support for more detailed assistance.