Cannot install Symantec client even after deleting PendingFileRenameOperations

Hi,

I need install Symantec client, having error "...pending system changes that require a reboot" when installing. I followed https://support.symantec.com/en_US/article.TECH98292.html; i.e., Search for the entry "PendingFileRenameOperations" in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
If you find the entry, first back up each key, and then delete the entry in each key.

Problem I am having is that the entry "PendingFileRenameOperations" is appearing again. I delete the entry from registry, but once installation of SEP is launched; the entry appears again.

Thus I cannot install the client. Please help.

Thanks