Just purchased True Image 2013 but can't install it - XP Pro SP3

Just been trying to install True Image 2013 after purchasing an extra copy for the old IBM Thinkpad T30.

At the moment I'm getting the following error:
Windows Installer could not be accessed

I have also just installed MS Windows Installer 4.5 Hotfix but it seems True Image cannot "see" it.

Any solutions before I ask for a refund.....?

I have the saved the error log file:

=== Verbose logging started: 23/07/2013 17:50:45 Build type: SHIP UNICODE 4.05.6001.00 Calling process: C:\DOCUME~1\Neil\LOCALS~1\Temp\4BDA6E81-E002-4CB3-B8DB-70BF22E14EED\atih_installer_shell_standard.exe ===
MSI (c) (08:D4) [17:50:45:599]: Resetting cached policy values
MSI (c) (08:D4) [17:50:45:599]: Machine policy value 'Debug' is 0
MSI (c) (08:D4) [17:50:45:599]: ******* RunEngine:
******* Product: C:\DOCUME~1\Neil\LOCALS~1\Temp\4BDA6E81-E002-4CB3-B8DB-70BF22E14EED\AcronisTrueImage.msi
******* Action:
******* CommandLine: **********
MSI (c) (08:D4) [17:50:45:599]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (08:D4) [17:50:45:599]: Grabbed execution mutex.
MSI (c) (08:D4) [17:51:16:163]: Failed to connect to server. Error: 0x80080005

MSI (c) (08:D4) [17:51:16:163]: Failed to connect to server.
MSI (c) (08:D4) [17:51:16:163]: MainEngineThread is returning 1601
=== Verbose logging stopped: 23/07/2013 17:51:16 ===

Neil :-(