Since installing excellent, free antivirus program AVG Free 8.0 on both my laptop and my PC I have been more than happy with the experience. It appears to runn smoothly without a notceable performance hit and my machines haven’t become riddled with virus’s (touch wood).
However just recently the automatice update has been failing with the following message.
Invalid Update Control CTF File
After doing some research and exploring on my machines it appears as though the CTF files have become corrupt in some way and need to be deleted.
How to Fix
Disclaimer: Remember to backup everything before making any changes.
As far as I am aware this only applies to Windows Vista and XP. Navigate to the following locations and delete only the CTF files leaving the BIN files on your PC’s (for me there were two ctf files I needed to delete).
XP: Navigate to “C:\Documents and Settings\All Users\Application Data\Avg8\update\download”
Vista: Navgiate to “C:\ProgramData\avg8\update\download”