Pesky error from AVG while updating says "Invalid Update Control CTF file"

Follow the instructions:

There are 2 files that can be deleted as AVG will recreate them. If they become corrupted you will have to remove them manually.

In Windows XP, go to:
C:\Documents and Settings\All Users\Application Data\Avg8\update\download
and delete
avginfoavi.ctf and avginfowin.ctf

In Windows Vista, go to:
C:\ProgramData\avg8\update\download
and delete these 2 same files.

Thanks to: http://thortweak.blogspot.com/2008/10/avg-update-control-ctf-file-fix.html