Erratic behaviour of Vista machine

Hello David,
We are sorry to know that. You can click on this link for the steps to uninstall AVG http://avgclick.me/UninstallAVGAV. Once the AVG is completely removed, you can download and install the latest version of AVG AntiVirus free in your computer and that should fix the issue.
Thank you

I installed AVG free virus checker on my Windows Vista machine (Microsoft has turned it back on Vista). One or two programs no longer start up - they get as far as the opening "flash" and lock up, AVG Zen reports "Well this is embarrassing we've run into a problem". I can't get past this message.  The machine will not log off or close down without hitting the off switch. Assuming a faulty installation, I am trying to delete AVG to reinstall but the uninstall routine is grinding away endlessly.

The previous virus checker (Microsoft Essentials) was removed using the uninstall in windows b fore AVG was installed.

Hello David,
We are sorry to know that. You can click on this link for the steps to uninstall AVG http://avgclick.me/UninstallAVGAV. Once the AVG is completely removed, you can download and install the latest version of AVG AntiVirus free in your computer and that should fix the issue.
Thank you