Originally Student version was offered in an .exe installer until complaints forced Digital River to offer an ISO. I haven't heard of Enterprise being offered as a Student edition, but if it's a school it is certainly a qualifying organization for volume licensing.
If you can browse into the Vista partition through Explorer and find the download it may be able to be converted into an ISO using this tutorial by SIW2 who is here to guide you: Make bootable iso from student d-l
Is this activated by your school or do you have a Volume License Key which is what is used to activate Enterprise?
You can download the ISO and burn to DVD using ImgBurn
at 4x speed, then follow these steps to Clean Install Windows 7
, or order it. You should have a disk for reinstalls or repairs.