Welcome to the wiki! Once you are registered you can help contribute to the content here...
Use the "Thumbs up" or "Thumbs down" icon to provide feedback on the level of usefulness of the various content on the wiki.
unable to upgrade XP pro to Vista Business, approved for upgrade by vista upgrade tool...........upgrade option greyed out
you can't upgrade from XP pro to Vista Buisness... that'll be why, Try Vista Enterprise :-)
I think You are using Windows XP Professional x64 bit edition, If so, you are eligible for an upgrade copy to a corresponding or better edition of Windows Vista, but a clean installation is required.
Try for Clean installtion of Vista Business.