Please help me! I installed avast! 4.6 home edition about two months ago and now my license is experied!! What shoul I do??Buy new license??? Please help me!! Thank you!!! :-[
Well taking 2 months into consideration, i’d say you forgot to register it (all avast! versions have 60 day trial).
avast! Home Edition Registration (FREE):
http://www.avast.com/i_kat_207.php?lang=ENG
This will extend the license to period of 1 year. After that you simply do the same again and you’ll extend it for another 1 year, and so on and so on as long as Alwil Software will offer us their nice piece of softare ;D
Thank you sooooooo much!!! 
Now my avast! antivirus works!!! :-* ;D