I have 1 primary 500gb HD with two partitons which I setup with Disk Director. On current active partition I have XP Home installed and active. I would like to install Vista on the second partition. Now I'm going to quote TIMANN from a few days ago "According to what I’ve read here I should use the OSS to hide the current active XP Pro partition and set the second currently hidden partition as active". I don't see how that is done. When I start OSS I can hide the XP partition, but I see nothing about the ability to set the second currently hidden partition as active. Even if I follow MudCrab's reply of "If you boot to the OSS menu, put in the Vista DVD, wait for the Vista DVD menu to come up, then right click on it and set the properties how you need (hide xp, set Vista partion Active and not hidden, etc.) When I right click on that Vista menu select properties, select the drive partition for XP I can select Hidden but the Active box is already checked but grayed out so no unchecking it. Then if I select the Vista partition the active box is unchecked but grayed out so I can't select it. Hidden is the only option available there too. How do I get the second partition to be active?