My Avast! Professonal Edition Trail Expired so I switched to Avast! Home Edition. Then I registered but it’s invalid. 
Dear user,Your registration of avast! 4 Home Edition was successful. You must now insert your license key into the program.
Your license key is:
---------- cut here ----------
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Next steps:
- Check that you have installed avast! antivirus on your computer! To download avast antivirus now, go to http://www.avast.com/eng/programs.html
- Highlight the license key above, then right click on it and select “Copy”
- right click the blue “a-ball” in the bottom right corner of the screen, then left click “About avast!”
- Left click “License key”
- Right click in the empty License Key box then select “Paste”
- Click “OK”. Your license key is now inserted and the program can now be used free of charge for a further 12 months.
For a video demonstration of how to insert the license key, please click on the following link:
http://www.avast.com/files/tutorials/insert_key.htmPlease note that under the license conditions avast! 4 Home Edition is for home, personal and non-commercial use only. Commercial versions of avast! can be found at http://www.avast.com/eng/desktop_solutions.html
If you experience any difficulties inserting the license key, please click here:
http://www.avast.com/eng/faq-registration-license.htmlThank you for choosing avast! antivirus software.
The ALWIL Software team.
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