Remember you are marking the Windows 7 partition Active. If it's a Logical partition you have to convert it to Primary first to mark Active.
Then click on the HD # to highlight it, from Disk tab select Rebuild MBR, Apply steps. Reboot to see if it starts.
This may preclude the need to run Startup Repair
up to 3 separate times with reboots from your Windows 7 DVD or Repair CD.
Si, Curious: what is the File System Check for? Maybe I should add it in these cases? Does it need to be run on all partitions to be complete, or just Windows 7?