Have you tried running the AVG removal tool? 32-bit version:    [URL] 64-bit version:  [URL]  
I had AVG (either free or basic, can't recall) and a number of months ago decided to download the newest free version. The instruction was to uninstall the latest version. So I went to the programs list and deleted all references in there to AVG, including AVG anti-rootkit. After I did that, the new download began and almost immediately was stopped as I was informed that download could not proceed as AVG anti-rootkit was detetected and needed to be removed. I ran a search to no avail. I have no idea where to locate this anti-rootkit file/program. And, of course, the problem now is that I had already uninstalled the avg earlier version and now cannot install the latest version. Can someone tell me how to locate and remove the avg anti-rootkit so I can finally install virus protection. Thank you.
Cannot install AVG 