You are not able to remove Symantec Scan Engine from Add/remove programs.
Symantec recommends uninstalling Symantec AntiVirus Scan Engine 5.x through Add/Remove programs or the Start menu.
To Remove Symantec Antivirus Scan Engine manually on Windows based computer.
On the Windows taskbar click Start > Program > Administrative Tools > Services.
In the right pane, right-click Symantec AntiVirus Scan Engine service > Stop.
To edit the registry and remove the Symantec AntiVirus Scan Engine keys
Exit all programs.
On the Windows taskbar, click Start > Run.
In the Run dialog box, type the following: regedit Click OK.
Navigate to the following registry keys:
Remove Symantec Scan Engine keys from the registry: WARNING : make a backup of the registry keys before deleting them.
Open the registry the registry editor.
Go to HKEY_LOCAL_MACHINE\Software\Symantec
If no other Symantec products are installed remove the sub-keys under Symantec
If other Symantec products are installed: remove the Symantec Scan Engine string from the “InstalledApps” key.
Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services
Remove the symcscan key
To remove Symantec AntiVirus Scan Engine files and folders
On the Windows taskbar, click Start >
Navigate to the following locations, right-click each, and then click Delete. <Drive>\Program Files\Symantec\Scan Engine <Drive>\Program Files\Common Files\Symantec Shared\Licenses -- Only delete if no other Symantec program installed. <Drive>\Program Files\Common Files\Virus Defs -- Only delete the Virus Defs folder if no other Symantec program installed.
NOTE: In case these folders cannot be removed (because they are still in use), reboot the machine and try again
In some cases it might be necessary to follow a few extra steps to ensure a clean uninstall.
Remove Symantec Scan Engine remnants from the Installer folder: From C:\Windows\Installer, remove all files and subfolders that refer to Symantec Scan Engine.
If the folder Installer is not visible, do the following:
WARNING : It is recommended to keep the Installer folder hidden!
Go to the File menu
Select Folder Options
Select the tab View
Uncheck “Hide protected operating system files (Recommended)”
Click “Yes” for the warning that appears.
The folder Installer should now be visible
Clear the Temp folders from Symantec Scan Engine-related files In case a reinstall is considered, clear the Temp folders from Symantec Scan Engine traces. These temp folders can typically be found in
C:\Documents and Settings\<Logon account>
Reboot the computer.
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