mine is the same
sometimes my internet says 'not responding' each time i download something!
im thinking you maybe have viruses or keyloggers ect.. on your computer your problem is quite similar because my computer alway freeze
then i told a friend and that intruduced me to geeksquad.com
those guys know everything about computers you name it
everything..
i called and hired one.. they really fixed my computer!!
it goes super fast... fast downloading no matter what
fast gaming ect.. fast surfing..
i hardly knew what he was doing but.. he inserted a ship into my moniter..
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anyway if your computer freeze like that i recommened you scan it