internet drops out

Hi, I have been having this problem for several months now. After surfing the net for around 40 mins+ my connection drops out. I have just purchased a new Belkin wireless modem however this did not fix the problem. If I reboot the modem this does not work. I have run winsock fix and this also does not fix the problem. The only way i can reconnect is to restart the computer. A few helpful notes: when I click on the connections tab in internet properties there is nothing in the dial up and virtual network settings box and I don't know how this is linked but my speakers don't work when this happens. Could someone please give me some advice on how to fix this problem. confused

 

anything, anything at all ????????