I'm having the exact same problem with Google Chrome, Comodo Browser, RockMelt (all chrome based browsers) and I do not use torrents etc. There must be a common denominator and I have seem this problem being discussed all over the web since 2009, so its nothing new - just yet to find a fix.. Luckily I have more than 1 notebook all running Win 7 x64 and 1 Vista Home Premium S0 x86 and it's only happening on my Dec 2009 ACER Extensa 5635Z.
If anyone has a solution yet, please let the 1000's of the same problems being posted on the web, be resolved once & for all. Google are you Home?
Thanks in advance guys.
JayiSM - Project Manager, "Open Web Devs Projects Initiative"