ive had the same problem. I thought it was my system though. Turns out my microwave was actially interfering with it some how. try to assign the network card to a spicific channel(if possible). another option is to change the ghz. it should be set at 2.4 by defult but you should be able to change it to 5. that will work for sure but the only problem is very few networks will work with 5ghz and you have to change your router to that to. if you got desperate you could by another network card and install it.
hope this helps somewhat, Hunter