try once to find matching drivers. most times default installations have crap drivers. also if you can try the card out in another pc. if it is the same: scrap the card, if not, scrap your windows installation ^_^. in that case your settings might be off. if you are not a registry junky try looking for some maintanance tool (good i’ve no idea how they are called) out there. most of them do a good job at fixing things.