Strange connection problems

I have a netgear box and intelPROset/ wireless card and software now my connection works fine for hours but if i start over using the connection by watching videos over my network or say on youtube downloading stuff etc it just decides to stop connecting but can still see the router jst want let me connect. TO get it working again i have to unplug the router and turn it back on. the strange thing is that my brother uses a different laptop at the same time and his works fine and so does the home PC so iv'e come the conclusion it must be something to do with the INTEL PROset but i might be wrong any advice
thanks