If you really want to change from AIS to Pro, you can contact Avast and have your license changed:
http://www.avast.com/contact-form.php?loadStyles.
If you are still having problems with your Security Center:
- Sometimes, Windows Action Center stop recognizing your antivirus or firewall... The fix could be fairly easy for the most part.
1. Go to Control Panel and open Administrative tools.
2. Click on Services.
3. Go down to Windows Management Instrumentation.
4. Stop this service. Stop the Action Center service too.
Let them Automatically start.
5. Exit out of this area to your desktop.
6. Right click Start and choose Explore.
7. Go to C:\windows\system32\wbem\repository.
Delete this subdirectory ONLY. Leave the others there.
Sometimes, only using Unlocker
http://ccollomb.free.fr/unlocker/, Delete FXP
http://www.jrtwine.com/ or KillBox
http://killbox.net/ you can delete these files.
8. Exit back to your desktop and reboot your computer (you might need to boot twice).
- This will rebuild the deleted folder and the database. Once restarted, Windows Action Center should show the correct information, and antivirus and firewall should now be recognized.
Also see:
http://forum.avast.com/index.php?topic=23457.0 – for all versions of Windows.
Let me know how things work for you.