I'm receiving the same error message.
[NEWTON_HS]
Pre-install steps completed successfully
RM Server components NOT installed on NEWTON_HS
Error: There was an error installing ZENworks Desktop Management on
NEWTON_HS. Error: Error copying files to server. Be sure that no ZENworks
Desktop Management files are open or locked.

this is from invlog.txt if it helps:
812: 812:Unable to create the password for the Service Object Inventory
Service_NEWTON_HS.Servers.NHS.HS.
826: 826: Unable to load the MGMTDBS.NCF file on the server NEWTON_HS.
1164: 1164: Unable to start the Inventory service on server "NEWTON_HS".
For more information, see the error message documentation.
812: 812:Unable to create the password for the Service Object WOL
Service_NEWTON_HS.Servers.NHS.HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.
1168: 1168: Unable to write version information to the registry on the
server NEWTON_HS.