Error 1500. Another program is in progress. You must complete another installation before continuing with this installation.

The first thing that comes to mind at this point is the reboot, which is usually the best method. Since the reason for this error may be that you are running multiple installers at the same time, a natural restart is the most convenient solution.
However, if the reboot doesn’t work, this is the time to consider whether Windows is a problem or not. I through the baidu, find a way to modify the registry, portal: = 74,

but I haven’t tried it yet, you can try it. If that doesn’t work, close all the visible installation Windows, CTRL + Alt + Delete, open task Manager, look in the process bar to see if there are any processes with the words “Install” or “Install” in them, and then terminate them. I solved the problem by finding a process called “Windows Circle R installer”, or Msiexec.exe, under the Background process Windows, and killing it. Reinstall and find the problem resolved.

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