There should be a minimized icon in the system tray. Right mouse click on it and choose 'close window' to end the uninstallation.
Launch task manager and end the process setup.exe, if it is still running.
Verify the following components have been removed from the APM web and APM application servers:
For older versions of Windows: HKEY_LOCAL_MACHINE\SOFTWARE\CA\Shared\ITAM
- On APM Web server: launch IIS manager, and remove the 'APMWebSite'
- From Control Panel\Programs\Programs and Features, right mouse click on the component CommonAdministrationforServiceManagement and uninstall
- In explorer, remove the directory <drive>:\Program Files (x86)\CA\ITAM
- In the registry (regedit), remove the entry:
For Windows 2012 and newer versions: HKEY_LOCAL_MACHINE\Software\Wow6432Node\CA\Shared\ITAM
Note: The APM installer checks for this entry, and if present, launches the 'Repair/Uninstall' window.
If this key is not present, then reinstallation is allowed.
Restart the server(s), and APM is ready for reinstallation.