When trying to install Symantec Endpoint Protection the following error may popup:
“Aanother service operation is currently in progress”
Try a reboot first, if not possible or problem still exists, try the following:
- Open Windows Registry Editor. Click Start > Run, type
regedit, and click OK. - Back up the registry.
Note: For Windows Registry backup and restore instructions, see How to back up and restore the registry in Windows. - In the left pane, navigate to the following key:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionInstaller. - In the left pane, right-click on the Inprogress key, and click Delete.
- Click Yes to permanently delete the entire Inprogress key and all of its subkeys.
Source: https://support.symantec.com/en_US/article.TECH218138.html