[Joke]

The problem is AVG and other on-demand virus scanners. I've found a fix to this that allows you to still scan the file when it's done downloading and doesn't involve modifying your virus scanner.

Simply go into the uTorrent options and select "Append .!ut to incomplete files" if this is activated then the files uTorrent is still downloading have an extension that AVG does not scan as part of its virus shield activities, however the .!ut is removed when the file is fully downloaded thus allowing AVG to "see" the file and scan it. By using this option you should not encounter the error anymore and still be protected when downloading torrents.

Enjoy!