GoBack Re-activation

Hi, I have done searches but cannot find my answer.

 

My computer has been taken over by Antivirus System Pro and I cannot do anything at all to get rid of it. I think my only option now is to run a complete recovery of my computer. If I do this I will obviously lose all my programmes - will I be able to re-activate my Norton GoBack or will I need to purchase the product again?

 

I have Norton GoBack 4.0 for Windows/XP

 

Thanks for any advice