Might want to check this out and change your update settings. Don't know if it is a real problem but if you are not using your PC to update other PC's it probably should be turned off.
http://www.pcworld.com/article/2955...cs-bandwidth-to-update-strangers-systems.html
http://www.pcworld.com/article/2955...cs-bandwidth-to-update-strangers-systems.html