AVG antivirus: "Invalid update control CTF file" in CCleaner Bug Reporting Posted November 4, 2008 · Report reply Do you have your CCleaner set to clean AVGF8? It normally won't, unless you set it up.This AVG Invalid CTF file issue has been fairly common lately- scroll around at freeforum.avg.com and you'll see lots of threads. They finally put up a Sticky and FAQ that you used. Hopefully you saved it, as you'll need it again. I had to use it 3 times on my Vista laptop and twice on my nephew's older HPXP laptop toward the end of last week. I did not do any "Ccleaning" and do not have Cc set up to clean AVGF8 (forgot how). Hopefully, whatever is causing this increase in the Invalid CTF file issue will work itself out. At least it's an easy fix. Thanks for the response. I have not set CC to clean AVG as I didn't delve that far into the CC settings. I did save the helper app and instructions for it. When I first searched the AVG website for data regarding the CTF file I used the website's main search engine. Nothing shows up via that route. When I returned to the website today I input the error text into the FAQs search engine and I found the helper app. Through your comments I feel somewhat relieved to know I am not alone in dealing with this glitch. And as you say, it is easy to rectify now that I know how.