Boot into 7, go to folder options, make sure Hidden files and folders and protected operating system files are showing.
Have a look on the active partition and see if Xp bootfiles are there as well as 7 bootfiles.
You may like to post a screenshot of that partition , and also of the Disk Management window.
To post a screenshot , click the Go Advanced button at the bottom of this page and follow step 8 onward of this tutorial. How to use the Snipping Tool in Vista - Vista Forums
Another thing that would be useful is a shot of bcdedit ( or copy and paste the contents of the cmd window).
Open an elevated cmd prompt, type: