AVG Antivirus – How to Stop Popup Upgrade Ads

Use MSE instead, it is much better and is Free also.

http://www.microsoft.com/security_essentials/

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To get rid of the shutdown dialog

(perhaps unsafely)

1. Open Task Manager
2. Find the messagebox dialog in the applications list. If you're not sure you found it, you can test by right clicking on what you think it is and selecting Bring to Front.
3. Right click on it and select Go to Process. You'll now be in the Processes tab with a process highlighted on the list.
4. Right click on the process and select Open File Location.

If it's an AVG-specific file (i.e. if it's in an AVG folder in Appdata or Program Files): Move it to another directory. It won't be able to autorun, but you'll still have it around in case it turns out you need it.

If it's not AVG specific (e.g. it's a DLL) that's a different can of worms.

To remove the installation

I'm not sure what to do about half-baked installs. If it were me I'd move the content out of Program Files (keep a copy in case you figure out you can, and really should, do something about it - a copy you can move back, etc) then redownload and reinstall it.