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Hi WhisperSister. Welcome to avast! Forums.
Which avast!; Pro, IS, Premier ?
Ask avast! to resend your license: http://www.avast.com/en-us/resend-license-paid.php
Repair avast!
With XP
Start > Control panel > Add & Remove programs > select avast! and click " Change/Remove ". Look for " Repair " and click it.
With Vista or win7
Start > Control Panel > Programs > Programs & Features > uninstall a program > select avast! and click " Uninstall/Change ". Look for " Repair "
Reboot when finished.
and then try the license avastlic file that was sent to you. Use one of these 2 methods:
http://www.avast.com/en-us/faq.php?article=AVKB7#articleContent