Thanks guys (note to Speedy: I did say that
don't involve a 120MB download - this machine is on a seriously throttled connection)
1. Repair install of 7.0.1465 - no success
2. Backed up settings
uninstalled from A/R Programs
reboot
3. Ran RejZoR's removal tool (on XP SP3 too!)
reboot
4.Ran AIS 7.0.1426 installer (already on the drive) which insisted on grabbing and installing the 'latest' version... waiting... which when completed turned out to be
7.0.1456 5. Upgraded to 7.0.1466 from within the UI
5. Recovered previously saved settings. Yippee!!
Smooth, easy... but far too long a journey to advance the release version by a single digit!