Update Windows
Window updates prevent and often fix install errors.
Check out Windows Update: FAQ on how to update your version of Windows from Microsoft,
Once the update finishes, restart your computer.
If you could open QuickBooks before you saw the error, Open QuickBooks and your company file.
If you weren't able to install QuickBooks, install QuickBooks Desktop again.
Manually fix Windows components
If the QuickBooks Install Tool and the update didn’t fix the error, you can repair specific Windows components yourself.
You should only do these steps if you’re an IT professional, confident Windows user, or have help from Microsoft support experts.
Repair or reinstall Microsoft .NET Framework
Repair Microsoft MSXML
Regards,
Caleb
Solutions to Resolve QuickBooks Error Code 1603
Solution 1: Repair issues using QuickBooks Install Diagnostic Tool
This Quickbooks Install Diagnostic Tool can help you automatically diagnose and fix the QuickBooks update error 1603 issues related to Microsoft.Net Framework, C++ & MSXML components.
Below are steps that you may follow to use this tool:
Download Quickbooks Install Diagnostic Tool
Install and run the application
Furthermore, it might take 20-25 minutes to complete the repair
Finally, restart your computer
You May Also Read: How to Fix QuickBooks Error 6209?
Solution 2: Repairing issues Manually
At times the Install Diagnostic Tool does not resolve many problems, therefore, we would be required to repair these components manually. Therefore, make sure you consult an expert if you are not fully sure about the troubleshooting. You’ll be required to follow the below steps in the order they have been mentioned to get an accurate solution of the problems:
Step 1: Download and Install Windows Updates
Download and Install Windows Updates
For Windows 10, 8.1 or 8
Firstly, click on the Windows Icon
Go to Settings
Meanwhile, go to Update & Security
Click on Check for Updates
For Windows 7
Click on Start Button
Go to Control Panel
Click on System & Security
Press on Windows Updates
Click on Check for Updates
Step 2: Restart the Windows Installer Service
Restart the Windows Installer Service
Go to Control Panel
Secondly, click on System & Security
Go to Administrative Tools
Double click on Services
Look for Windows Installer Service
Click on Restart Service
I hope both these solutions will be helpful to resolve QuickBooks error 1603.
Mark Wilson