How to Fix Error 0x80070420?

For repairing Windows update error 0x80070420, firstly you have to check whether Windows Installer 3.1 is installed in your PC or not. This error implies that you are not able to install the windows updates when you try to access them from the site. This happens when the windows updates stops in the middle of their installation process.

Further, you need to follow below mentioned steps:

Step 1: Click “Start” and choose “Control Panel”

Step 2: Now, you have to click twice on “Add/Remove Programs”.

Step 3: Now, you have to locate the program Windows installer 3.1 from the Program List produced under the, “Change or Remove Programs” section.

Step 4: Once you find the program list for the program Windows Installer 3.1, click on “Remove to uninstall it” and then restart your PC.

If in case, you didn’t find the program in the list, then go to this link at the “Microsoft's Download Center” and install Windows Installer 3.1

Step 6: Now, set up the application of Windows Installer 3.1

Step 7: Restart your computer

Step 8: Now, access the Windows Update option and start downloading once again the updates.