hi,
for some reason I’m getting this error message that my registration key has been temporarily disabled and also my definitions wont update. I tried downloading the defenitions from the website and installing those but then I got this message 
can some 1 help me or tell me how to fix it ???
Please use the search option on this board.
Keyword = 0x00000005
There are a lot of threads dealing with this error.
The solution may be in one of them.
If you are using the Home version, you might try registering again and you will be sent another key, try copying and pasting that.
avast! 4 Home Registration
wow, that was easy enough, thanks!! 
No problem, welcome to the forums.