You want to know how to uninstall Symantec Antivirus, Symantec Endpoint Protection,or Symantec Endpoint Protection Manager.. Or you have already removed the program from Add/Remove programs and that failed.
· Go to Add/Remove Programs and remove the program
· Try install
· If that fails, follow the manual removal process.
· Try the install again
· If that fails, run the cleanwipe utility. As a precaution, have a backup of the OS before using utility (This utility is provided by Symantec Technical Support)
· Search for and remove any old Symantec Endpoint Protection .MSI files.
· Install new version
References Please follow the link provided for the manual removal instructions in the following document: