system
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First of all make sure Zonealarm Firewall is alowing access to Ashmai, Ashdisp, and Avastsetup so Avast can update.
If that don’t work use copy & paste method to enter it into avast!; keep in mind that this number can´t be used on any server operating system. You have to be logged in Windows with administrators rights (to enter they key).
Also check if your system date is set correctly. The license key is valid for one year, so if you changed the system date to value when the key is expired, it become invalid. In that case set the system date correctly and enter the same license key again.
If that doesn’t work try re-registering it here http://www.avast.com/i_kat_207.php?lang=ENG
–lee