Let me help you troubleshoot the login issues you're experiencing with QuickBooks Desktop. Here are some possible causes and solutions to resolve the problem.

To begin with, please ensure that your internet connection is stable, as connectivity issues can prevent you from logging in.

If your connection is stable and you're still facing issues, let's try forcing QuickBooks to close. This can help refresh the application and eliminate any unresponsiveness. Here’s how to do it:

1. Press Ctrl + Shift + Esc to open the Task Manager.
2. Locate QuickBooks in the list of processes.
3. Select it and click on End Task.
4. Once this is done, relaunch QuickBooks as an administrator.

Moreover, If the above steps don’t resolve the issue, I recommend using the QuickBooks Tool Hub. This tool can help fix common software problems. Here’s how to get started:

1. Close QuickBooks.
2. We recommend you download the most recent version (1.4.0.0) of the QuickBooks Tool Hub. Save the file somewhere you can easily find it (like your Downloads folder or your Windows desktop). Note: If you've already installed Tool Hub before, you can find out which version you have. Select the Home tab. The version will be displayed on the bottom right, or you can select About to view the version.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the installation finishes, double-click the icon on your Windows desktop to open the tool hub.

If you can't find the icon, do a search in Windows for QuickBooks Tool Hub and then select the program. Once done, you'll want to run the Quick Fix my program from the Tool Hub. Here's how:

1. In the QuickBooks Tool Hub, select Program Problems.
2. Select Quick Fix my Program.
3. Start QuickBooks Desktop and open your data file.

For other available solutions, please visit this article: Fix issues when QuickBooks has stopped working.

Lastly, for future reference regarding the manual payment and filing of payroll taxes and forms in QuickBooks Desktop Payroll, you can check this article: Pay and file payroll taxes and forms manually in QuickBooks Desktop Payroll.

If you have any further questions or need additional assistance with managing your QuickBooks Desktop for payroll, please don't hesitate to reach out. We're here to help you anytime