Installation failure - fails to update after successful installation. Error code: 146

I'm having an issue with installing endpoint protection on a client pc.

win7 pro -

Tamper protection has been disabled via the cloud interface -

I am successful in removing the old installation of endpoint -

New installation apparently goes through successfully, except for error code returned as 146.

Sophos reports this as:

Which I take as the equivalent of "bad command or file name", e.g. useless information other than "it didn't work"

All attempts at updating fail - windows firewall is turned off - no other system on this LAN segment are having issues with sophos updates -

I've ripped/repaved sophos with no success.

Bootstrap log shows the following data:

6/12/2017,11:45:13 AM,Information,------------------ Beginning installation of Sophos Anti-Virus and AutoUpdate ------------------,
6/12/2017,11:45:13 AM,Information,Setup version 3.3.2.222,
6/12/2017,11:45:13 AM,Information,Command line: c:\users\local_admin\appdata\local\temp\sophos_bootstrap\setup.exe -server dzr-mcs-amzn-us-west-2-fa88.upe.p.hmr.sophos.com -token ***************** -edxtimestamp 20170612T163228Z,
6/12/2017,11:45:13 AM,Information,Process security set successfully,
6/12/2017,11:45:13 AM,Information,Setup program was run from C:\Users\local_admin\AppData\Local\Temp\sophos_bootstrap,
6/12/2017,11:45:14 AM,Information,Checking system TMP paths.,
6/12/2017,11:45:14 AM,Information,Checking TMP...,
6/12/2017,11:45:14 AM,Information,Temp path for System found: 'C:\Windows\TEMP'.,
6/12/2017,11:45:14 AM,Information,Unable to query DWORD: Software\Sophos\SAVService\TamperProtection\Enabled,
6/12/2017,11:45:14 AM,Information,SAV TP enabled: 0,
6/12/2017,11:45:14 AM,Information,SED TP enabled: 0,
6/12/2017,11:45:14 AM,Information,Ignore SAV TP: 1,
6/12/2017,11:45:14 AM,Information,SED TP effective: 0,
6/12/2017,11:45:14 AM,Information,Migration: 0,
6/12/2017,11:45:14 AM,Information,Migration ID: ,
6/12/2017,11:45:14 AM,Information,Migration Job: 0,
6/12/2017,11:45:14 AM,Information,SEC initiated: 0,
6/12/2017,11:45:14 AM,Information,SEC-initiated migration: 0,
6/12/2017,11:45:14 AM,Information,Checking if Sophos Anti-Virus or Sophos AutoUpdate are installed...,
6/12/2017,11:45:14 AM,Information,Starting wizard to collect information from user...,
6/12/2017,11:45:31 AM,Information,Checking for internet connectivity...,
6/12/2017,11:45:32 AM,Success,Successfully connected to the URL http://dci.sophosupd.com/.,
6/12/2017,11:45:32 AM,Information,Checking for internet connectivity...,
6/12/2017,11:45:32 AM,Success,Successfully connected to the URL dzr-mcs-amzn-us-west-2-fa88.upe.p.hmr.sophos.com/.../ep.,
6/12/2017,11:45:44 AM,Information,Starting the install sequence.,
6/12/2017,11:45:44 AM,Information,Checking for local third-party software...,
6/12/2017,11:45:44 AM,Information,Sending data back to Sophos...,
6/12/2017,11:45:44 AM,Success,Successfully connected to the URL d1.sophosupd.com/.../x.xml.,
6/12/2017,11:45:44 AM,Information,Done.,
6/12/2017,11:45:44 AM,Information,Installing MSI...,
6/12/2017,11:45:44 AM,Information,Remove Sophos Endpoint Defense,
6/12/2017,11:45:44 AM,Information,Starting Sophos Endpoint Defense uninstall.,
6/12/2017,11:45:48 AM,Information,Sophos Endpoint Defense uninstall completed.,
6/12/2017,11:45:48 AM,Information,Sophos Endpoint Defense uninstalled.,
6/12/2017,11:45:48 AM,Information,Copying ESCDP.dat...,
6/12/2017,11:45:48 AM,Information,SAV not present, skipping install.,
6/12/2017,11:45:48 AM,Information,Registering SAV with AutoUpdate...,
6/12/2017,11:45:48 AM,Information,Installing MCS...,
6/12/2017,11:45:48 AM,Information,Started installing C:\Users\local_admin\AppData\Local\Temp\sophos_bootstrap\mcsep\Sophos Management Communications System.msi ...,
6/12/2017,11:45:54 AM,Information,Registering MCS with AutoUpdate...,
6/12/2017,11:45:54 AM,Information,Successfully enabled Endpoint Defense for MCS.,
6/12/2017,11:45:54 AM,Information,Installing sau_xg,
6/12/2017,11:45:55 AM,Information,Started installing autoupdate ...,
6/12/2017,11:46:28 AM,Information,Sucessfully enabled Endpoint Defense for SAU.,
6/12/2017,11:46:29 AM,Information,Register with MCS...,
6/12/2017,11:46:29 AM,Information,The SAU configuration could not be retrieved, pre-check for configuration not done.,
6/12/2017,11:47:06 AM,Information,Triggering update...,
6/12/2017,11:47:06 AM,Information,Update in progress detected, waiting,
6/12/2017,11:47:17 AM,Information,Update appears to have finished,
6/12/2017,11:47:18 AM,Information,Got update result with 500 tries left...,
6/12/2017,11:47:18 AM,ERROR,There was an unexpected problem with the installation of Sophos Endpoint Security and Control. Details: The update failed,
6/12/2017,11:48:31 AM,Information,Sending EBS feedback to Sophos...,
6/12/2017,11:48:31 AM,Information,Sending data back to Sophos...,
6/12/2017,11:48:31 AM,Success,Successfully connected to the URL d1.sophosupd.com/.../x.xml.,
6/12/2017,11:48:31 AM,Information,------------------ Found errors during installation: 146 ------------------,
6/12/2017,11:48:31 AM,Information,------------------ Installation program finishing with code 146 ------------------,

Any help would be greatly appreciated.

Cheers!

~J