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In case somebody else has this problem (or the original poster didn’t find a solution), I solved a similar problem by adjusting the avast settings. In the Troubleshooting section, I ticked the option “Load avast! services only after loading other system services”. A message appeared warning me that my machine would be at risk of infection during the startup phase, but when I re-started the computer, iTunes was once again able to see my iPod Touch.