registration doesn't work

Hi,

my registrationcode doesn’t want to work …it’s invalid ,i tried everything could some one tell me what to do?
I copy and pasted it ,tried to get a new one still nothing,logged in with admin still nothing.
I’m using vista home premium.

greetings,

tke

See the tutorial: http://www.avast.com/files/tutorials/insert_key.htm

Is your system date/time correct?
Are you sure you do not include the ‘last blank space’ in the paragraph while copying & pasting?