Error 2869 in installing LD 7.3.1 on Server 2008 R2

Hi,

We failed trying to install LD 7.3.1 on Server 2008 R2 in this morning.. We've looked thoroughly through the forum and applied all the tricks but still getting the 2869 error. We are logged in as Admin and running the MSI as Administrator, even tried via elevated command prompt.

Touchpaper Software key is in registry under wow6342node

IIS 6 Mgmt Compatibility is installed

All Roles Services installed as advised

IIS Authentication permissions set as advised

msi run via msiexec /i

AV software switched off

UAC switched off

Installing to default locations

The MSI log files show it fails here (full log attached):

Action 10:33:53: PublishProduct. Publishing product information
1: Console.ico
1: ConsoleConfig.ico
1: Ticker.ico
1: DataImport.ico
1: MailInbound.ico
1: MailOutbound.ico
1: TelephonyApp.ico
1: CiLinking.ico
1: {E7C09DD1-A95F-4BA3-BB8F-3FBE51A89988}
Action 10:33:53: CiLinkingService.Rollback.
Action 10:33:53: CiLinkingService.Install.
DEBUG: Error 2869: 

The dialog ErrorDlg has the error style bit set, but is not an error dialog
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2869. The arguments are: ErrorDlg, ,
MSI (c) (44:00) [10:33:57:134]: Product: LANDesk Service Desk — The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2869. The arguments are: ErrorDlg,

Help is needed. Thanks in advance.