Activation key doesn't work

[system]

I have got the license key through email when I registered,but it doesn’t work…how to activate Avast with this key? Please help…

[Pondus]

You dont say what avast you have…

Registering avast free http://www.avast.com/faq.php?article=AVKB9#artTitle

Insert license in avast PRO http://www.avast.com/faq.php?article=AVKB8#artTitle