Avast update has locked up computer

I updated Avast and now I can't get a complete boot. I get the Welcome screen, enter my password, and am told that it is loading my programs - then nothing. I presume that I need to uninstall Avast using PC Doctor - which I can reach - but I don't know how to do it. Any suggestions will be MUCH appreciated.

Hello,
Have you tried starting the computer in Safe Mode by repeatedly tapping the F8 key just as soon as the ThinkPad logo disappears from the screen to get to the Boot Menu? From there, you may be able to boot the system and then uninstall Avast from it's entry on the Start Menu.
You may want to check with Avast technical support, though, as they may have some alternate suggestions about how to solve the problem.
Regards,
Aryeh Goretsky
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