AVG Installer Error Code 0xc0070643

This error is caused by the new version of AVG not being able to remove a previous version.

If you open C:\Program Files you will see an AVG folder.

When you try to manually remove this you will get an access denied error.

Either remove this using the AVG Removal tool or via the command line:

http://www.avg.com/gb-en/faq.pnuid-13467520611786d745f6846c853c9f7155b5ecd9a7898