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Enable dual boot
how to enable dual boot os selection during system startup after installing xp in win7
how to enable dual boot os selection during system startup after installing xp in win7
Did you create a second partition for XP and install it as shown here? Dual Boot Installation with Windows 7 and XP
What often works best is to start Win7 again by Marking 7 Partition Active then running Startup Repair - Run 3 Separate Times.
Then you only need to install EasyBCD 2.1.2 to add XP on it's Add OS Entry tab. EasyBCD (free Download at bottom of page - no name or email required)