You said you reinstalled Windows on computer, but did the computer originally come with Windows 7?
Did you use a recovery disk provided by manufacturer, a Windows 7 Upgrade kit, or your own retail Windows 7 DVD?
If the computer came with Vista, did you make the recovery disks before installing Windows 7 as the recovery partition is most likely disabled with Windows 7 installed, and is interfering by claiming the Boot.
If the computer came with Windows 7 then we need to see if the recov is still functional. Type recovery in start box and see if you are able to enter Recovery or make Recov disks. Reboot computer and tap F-key listed on first boot screen for Recovery to see if it loads.
Dont' panic as this is fixable - we do these here every day.