I'm not sure what to do but I think the problem is that your boot file is in XP. I think if you type msconfig in run and look on the boot tab I think you have change or delete something. I'm not sure I don't dual boot any more. I found this How to Remove Windows 7 from dual boot I found this video but it's a bit complex involving command prompt Video: Remove Windows XP from a dual-boot configuration with Windows 7 | TR Dojo | TechRepublic.com .
On Windows XP and 2000 click start, right click on my computer and click properties, a window will appear, here you must click on the tab titled “system
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Be warned again: unlike the Windows XP to Windows 7 upgrade originally performed, this clean Windows XP installation will erase the laptop hard disk, |
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If companies switch 1% of their PCs from XP to Windows 7 each month, Windows 7 could be the market leader by the end of next year. |
Follow these tips to deal with an XP system that won't recognize flash drives, restore an XP backup in Windows 7, and solve IE script errors in Windows XP.
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But a just-released report from Forrester shows that Windows XP still rules the business world, where it beats Windows 7 by a margin of 7.5 to one.
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The lecturer is using Windows XP Tablet PC Edition. Can't she upgrade to Windows 7...
Cook'n Recipe Organizer 9 (8.2 w/free upgrade to 9) W/2 FREE Expansion sets---Windows 7 /Vista / XP / Me / 98 /9... 
Gadgetwise Blog: Q&A: Taking the Upgrade Leap From Windows XP to Windows 7 
Q&A: Taking the Upgrade Leap From Windows XP to Windows 7 
Q&A: Taking the Upgrade Leap From Windows XP to Windows 7