https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146393#M5024 Computers failed to start Canon EOS as of 6/15/2015. Win 7 Pro, Win 7 Home Premium, Win 8.1. Total of 4 computers checked so far, all failed. Looks like just after a windows update. All running the latest version of EOS. Fri, 17 Jul 2015 15:32:20 GMT chicomphoto 2015-07-17T15:32:20Z https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146393#M5024 Computers failed to start Canon EOS as of 6/15/2015. Win 7 Pro, Win 7 Home Premium, Win 8.1. Total of 4 computers checked so far, all failed. Looks like just after a windows update. All running the latest version of EOS. Fri, 17 Jul 2015 15:32:20 GMT https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146393#M5024 chicomphoto 2015-07-17T15:32:20Z https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146398#M5025 AVG is the problem, turn it off and it works. Fri, 17 Jul 2015 16:30:03 GMT https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146398#M5025 chicomphoto 2015-07-17T16:30:03Z https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146686#M5026 Just uninstalled it, hopefully it works! Tue, 21 Jul 2015 02:53:39 GMT https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146686#M5026 jenn 2015-07-21T02:53:39Z https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146849#M5027 AVG was the issue...EOS started right up as soon as I uninstalled AVG! Thanks! Wed, 22 Jul 2015 21:43:33 GMT https://community.usa.canon.com/t5/Camera-Software/EOS-stopped-working-after-latest-windows-update/m-p/146849#M5027 jenn 2015-07-22T21:43:33Z