Control Panel>>System>>Device Manager>> Network Adapters>>Belkin Wireless Adapter>>Properties>>Power Management Tab>> Uncheck the box that says "Allow the computer to turn off this device to save power" that should work! I had teh same problem.
Lineen - just read your "fix" and am trying it .. I had about given up hope ...was ready to get of the computer altogether.. I did notice that the other two PCs on my network did NOT have power saving checked and they woirked fine, all the while my main C was dropping every half hour or so... thanks so much for the solution, let's hope it works!