Autodesk Revit Architecture

[#1]

Hi,

   My computer crashed and now I cannot get on any of my autodesk programs.  I am in need of the programs to finish all my homework due next week.  Revit comes into a view mode and says: 4)autodesk revit architecture 2012 build 20110309_2315(x64)   License unavailable.  A license is required to run autodesk architecture 2012 on this computer.  How do I fix this problem.  Autodesk Revit architecture is in viewer mode.

Help!!!

[#2]

not sure about this,but can you borrow a license?

[#3]

You will need to reactivate your product.