"not found" error message

Avast asked me to update the program and I did. But when it asked to restart, I clicked no. I later shut down the computer and when i signed on the next day I got this error message which I continue to get every time I sign on: AvastULexe-EntryPoint Not Found
The procedure entry point AavmRpcRunSystemComponent could not be located in the dynamic link library AavmRpch.dll.

The only difference to my computer is that I can NOT type in or choose an address when I sign on to my AOL account. I can read my email but can’t click on a link within the email.
Would appreciate any help.

I suggest an installation from scratch:

  1. Download the latest version of avast! Uninstall Utility and save it.
  2. Download the latest avast! version and save it.
  3. (Optional) If you want, save your avast! settings for later restoration (Settings > Maintenance > Back up).
  4. Uninstall avast from Control Panel (if possible). If, for any reason, you can’t run it, try booting in Safe Mode and doing it from there. Anyway, boot after that.
  5. Run the avast! Uninstall Utility saved on 1 in Safe Mode. Boot after you’ve run it. Repeat this for any major avast! version you have ever installed/upgraded in your computer.
  6. Install avast! using the setup saved on 2. Boot.
  7. Register your free copy or add the license key for Pro. Or even upgrade your key from old versions.
  8. Check and post the results. If, for any reason, you did not solve, try doing the step 3 in Safe Mode anyway.