keenart: I asked the question in the e-on tech support as the upgrade I'm supposing is costly as you know!
This is their response, pretty much what you said I think!

*Vue should run just fine on that system.  You should have no problems installing Vue.  The most important thing is to run Vue as an administrator.  Right click on the Vue 6 icon and select  Run as an administrator. Or, right click on the Vue icon, select Properties.  Select the Compatibility tab.  Under Privilege Level, select Run the Program as an Administrator.  It will then allow you to enter your registration details and save them.

Continue to run Vue as an admin to avoid rights issues with any directories you may be accessing.*

Injustice will be avenged.
Cofiwch Dryweryn.