Is Catia V5 just for 1 install?

i bought Catia v5 student edition back in few months. Today i need to format my PC and after that i couldnt re-install my Catia. i have install files and my TargetID generator but on "My Orders" tab in software.3ds.com it just like i never get Catia at first place. Its all grey and i cant re-activate my PC again. So i wonder is there any way to fix it or Catia Student edition is just for 1 install?