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#11
As far as removing XP from the single-HD dual boot, can you please post back a screenshot of your full Disk Management drive map, using Snipping tool in Start Menu and attaching file using paper clip in reply box.
We can then tell you what is required to remove the XP partition so that it doesn't interfere with the Win7 boot.
If Disk Management is not allowing you to delete XP, it is most likely because it is system active. The Win7 partition needs to be marked active, then using the excellent free Partition Wizard CD delete XP, Resize WIn7 into it's space, then boot into the Win7 DVD repair console to run Startup Repair 3 times to write the MBR to newly resized Win7 partition.
We do these every day here with about a 95% success rate, but you should back up your files and perhaps a Win7 drive image because resizing operations can fail.
We can advise you for certain once you post back the Screenshot.