I have 38 days left on my demo Avast4. I registered and was emailed a registration number. But, when i try to insert it in the license box it always says invalid. Do i have to wait for my demo to run out before i can use the number i was sent?. Thats hard to believe,then i would not be protected for a short period of time and would probably have to download the program again.Im sure im NOT doing something very simple and basic. Please in layman terms just tell me where im going wrong,and what to do. Thanks.