First, I would remove your email address from your post so spammers do not harvest it. You can do this by going back to your original post > click the Modify button and delete your email > Save.

Questions:

  1. What product of Avast did you install? Free, Pro, AIS?
  2. What version did you install?
  3. What license is the version for?
  4. Did you reboot after installing?
  5. Where you online (on the Internet) and trying to register through the Avast GUI? This is the best way to register the product, then reboot. If you have the Free version, you do not need a key. For the Free version http://www.avast.com/registration-free-antivirus.php.

If however you do not see the Avast toolbar in the bottom of your screen, please try an Avast Repair:

  • Go to Control Panel > Add/Remove programs > Avast Antivirus.
  • Scroll down and choose Repair function in the pop-up window.
  • Reboot.

Let me know how this goes and answer the above questions as well as what your OS is. Thank you.