I was using Windows 7. I wanted to uninstall a program. I went into Control Panel > Programs and Features, selected the program to uninstall, and clicked Uninstall. This gave me an error message:
Please wait until the current program is finished uninstalling or being changed.I ran a search and found various forms of advice. Trying the easiest solutions first, the one that worked for me was to go into Task Manager (Ctrl-Alt-Del), go to the Processes tab, and end InstallManager.exe. A few other possibilities were to run Revo-Uninstaller; to run CCleaner; to look in Task Manager for any other processes that said Setup or Installer; to reinstall the program and then try uninstalling; or to reboot and try uninstalling in Safe Mode.