Let my Netbook update yesterday , big mistake , it installed IE10.
Pffftttt what a load of Junk ! it cross platformed in windows and blocked all downloads and reported even text files as a virus! Also stopped Chrome and Firefox , although in firefox you can tell it to not scan downloads.
Gone back to IE9 version and blocked it from updating , not that i use it , but with it's new feature's it takes control of all the browser's.
Beware if you have updated and suddenly find your downloads blocked.