How to Solve “Invalid Update Control CTF File” Errors on AVG

I’ve been getting “Invalid Update Control CTF File” errors for quite some time whenever I try to update my local copy of AVG Free, the virus protection I use on my Windows boxes.¬† I finally dug around and found the solution to the problem. Some of the downloaded files are corrupt. (I actually assumed that from the error I received.¬† Is nice to know I was correct.) You have to go into your Windows Explorer and delete the *.ctf temp files in C:Documents and SettingsAll UsersApplication DataAvg8updatedownload¬† Don’t delete the *.bin files as those are the ones that were compiled on previous updates. (It would be nice to see them all made into one file though.) I hope this helps someone. Update: I know I wrote this post for WinXP users but Doug notes in the comments below that Vista users can find AVG’s saved files in the C:ProgramDataavg8updatedownload...

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