If you don't have any luck with checking the event logs then try -
go to start, control panel, system . advanced then click on 'settings' under startup and recovery and unselect the 'Autiomatically restart; under system failure. this will give you an error message instead of auto restarting and then you can google for it or post it on here.
also what windows & browser are you using?
( you could also try updating your sound drivers )
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