To download, install and run Install Diagnostic Tool QuickBooks, follow the steps given below:

• First of all, go to the Intuit website to download the QuickBooks Diagnostic Tool.
• When prompted, save the QB Install Tool file to the desktop.
• If you any open programs on your PC, just close them before proceeding further.
• Look for the Install Diagnostic Tool QuickBooks file, which is an .exe file on your desktop.
• Double-click the .exe file.
• You will find that QuickBooks Install Diagnostic Tool will get opened.
• A license agreement window will appear.
• Look for the Yes button and click on it.
• To run the scan, click on the Proceed button.
• When you see that the scan has finished, you are required to restart the PC.
• After using the tool, it may be required that you have to register again your QB or again activate your QB.
• Update your Windows operating system.
• Finally, restart your system.