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#310
You need to make sure the 7 partition is the System partition.
Look in Disk Management - you will probably see the XP partition labelled as System.
If so, rt click the 7 partition and Mark it Active.
Then run startup repair from the 7 dvd 3 times.
You should then boot into 7 - see it is labelled System - then you are OK to do what you want to the XP partition.
Hope it helps