I used to use Vista Ultimate a while back, but changed to XP as it was too buggy.
I have installed XP Professional N about 6 months ago. I am trying to run my Vista Ultimate CD to upgrade my XP install to Vista Ultimate now.
However the 'upgrade' option is disabled when I click through the install. It says "Upgrade has been disabled".
I have checked the FAQ's around the net. I have the harddrive format in NTFS. I am unsure what else, but I need to get the upgrade function to be enabled. I also run upgrade advisor just for fun and there were no issues, obviously however I had had Vista installed on here prior to formatting and installing Xp months back.
Any help apreaciated.