Yes , you can use any 7 installation dvd, or recovery disc as long as it is the correct bit version.
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How do you swap the active flag? In computer management I see one partition set as active but it does not allow me to make any other partitions on that disk active.
Disk Management will allow you to set a Primary partition Active. You may have an Extended partition containing Logical drives. It has a dark green border.
Please post a screenshot of Disk Management.