About to purchase Win 7 using the £30 Student Offer but not sure exactly what I will get. I currently have XP Pro retail so if I replace my pc with a new build I can reinstall my fully licenced version of XP Pro, If I purchase the student version does anyone know if I get the retail version and can move from pc to pc ( only on one pc at a time ), Also is it a download or do I get the full disk from Microsoft?