Maintaining connection from PC to aiorport express

I have a airport express connected to a router. When I start my PC it connects immediaetly without any trouble but after some time (20 to 30 minutes usually) the connection drops out. It does not appear to be a problem with the wireles network equipment as the indication in the bottom right of the windows screen show that that there is a good signal. My problem is that my network disappears from within the airport admin utility window. Nothing happens if I choose re-scan from the admin utility. I have to re-start my Pc to connect again. My powerbook works continously without any problems, so could it be some setting I need to change in windows?

that's interesting because my PCI adapter/card (the card with the aeriel in the pc) is netgear. Mayby our problems have to do with the netgear software?

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