What should I do if I can t install the program and uninstall it?

The meaning of the error message is:

Error **1721There is a question about the windows installation package. One of the programs required to complete this installation cannot run. Contact your support or package vendor.

This should be a problem with the Windows Installer service. To resolve this issue, re-register the Windows Installer service. Steps:

1.Start your computer in safe mode.

Restart your computer.

After the BIOS information is displayed, press F 8.

Use the Down Arrow key to select Safe Mode on your Mac, and then press Enter.

2.Log in to the computer as a local administrator.

3.Click Start , click Run , type , and then click OK.

4.Type msiexec unregister in the command prompt and press Enter.

5.Type msiexec regserver at the command prompt and press Enter.

6.The above steps complete the registration of the Windows Installer service. Now open Add or Remove Programs and see if you can remove the software program or run the program you want to install again.

If you have a backup, it's best to restore your system. Reinstall without backup. I have encountered a similar situation, and I have been doing it for a long time or reloading. FYI.

Then delete it manually, delete all the files of the software, and delete it in the registry.

Me too, I didn't know any other way, so I had to reinstall the system.

I don't know, if you're willing to pay 30**, I can remotely help you install it.

Summary. Hello! The computer software is not uninstalled, install it again, and the solution cannot be installed, 1. The first step is to open the window in the lower right corner of the computer, enter the regedit command, and click the OK option;

2. In the second step, in the pop-up page, select the "software" folder option in "heky local maching".

3. Step 3, then in the pop-up interface, select the "CurrentVersion" file in "Windows" under "Miscrosoft" again.

4. Step 4: Follow the above steps, click Open in turn, and finally find the "Uninstall" option button.

5. Step 5: Click to open the "uninstall" folder, select the program you uninstalled before, and select the residual registry file to delete.

The computer software is not uninstalled cleanly, and it is installed again, but it cannot be installed.

Hello! The computer software is not uninstalled, install it again, and the solution cannot be installed, 1. The first step is to open the window in the lower right corner of the computer, enter the regedit command, and click the OK option; 2. In the second step, in the pop-up page, select the "software" folder option in "heky local maching". 3. Step 3, then in the pop-up interface, select the "CurrentVersion" file in "Windows" under "Miscrosoft" again. 4. Step 4: Follow the above steps, click Open in turn, and finally find the "Uninstall" option button.

5. Step 5: Click to open the "uninstall" folder, select the program you uninstalled before, and select the residual registry file to delete.

Then install it and you can install it.

Hello! The above is the solution to the problem that the computer software is not uninstalled and installed again.

Hope mine is helpful to you.