probably the same issue plaguing your keyboard
Honestly itunes became a huge resource hog ages ago and chrome (actually anything 'google' makes for windows is the same) isn't much better in my experience.
Having said that have you got the latest drivers installed, it could be a dodgy network connection
ah a key piece of information being left out.... most likelyHaving said that, the network is a bit slow, is this due to 10, being updated in the background