You need an ISO to burn to DVD with ImgBurn at 4x speed, or using Windows Image Burner, to run repairs or reinstall.
In fact you need to boot it now with all other HD's unplugged to make sure Win7 partition is marked Active
, then from System Recovery Options run Startup Repair - Run 3 Separate Times to write the System boot files to the Windows 7 partition..
To make your iso, extract the files from the .exe to your desktop, then compile the files into an .iso using this tool: BootISOmaker - Windows 7 Forums
After complaints that the Student Steal fulfiller didnt' provide an ISO, MS also made good here: Microsoft Fixes Windows 7 Student Edition Upgrade Problems - Windows 7 student edition - Gizmodo