|Downgrade from Vista Business to XP Pro|
When an End User Customer is using both Microsoft® Windows® XP media and a product key that was previously activated when exercising its downgrade rights, they will fail activation due to hardware configuration changes when installing on the Windows Vista™ system. In these cases, the End User Customer will be prompted to call the Activation Support Line and explain their circumstances to the Customer Service Representative. Once it is determined that the End User Customer has a valid Windows Vista Business or Windows Vista Ultimate license, the Customer Service Representative will help them activate their software.
The Activation Support Line telephone numbers are 0800 676 334 and +64 9 356 3093.
Also see: Vista Downgrade Rights