GA 3

I had GA3 working great with Cubase 32 bit but due to an accidental burn out of my System I had to reinstall the whole thing, Now I I find that GA3 does not work at all in eather Cubase 64 or 32 bit. All configurations are the same as they were when all was well.
Can any one please help me ?? I am a very frastrated muso trying to do some work. :cry: :cry: :cry:

Many thanks in advance.

ps: if you have a solution please be specific as to what steps I should take