Windows 7 Wifi crashes

[Jack!]

Right, whenever it is just me, or me and my xbox, or me and anything else the network runs fine, But as soon as my mum turns on her windows 7 netbook and connects, its lasts around 5 mins then it causes the default gateway goes offline, and I have to run a diagnostics on the network, which takes around 5 mins of everything being offline, including my server, which is really quite annoying.

Any idea why the netbook is causing the default gateway to go offline? It ran fine on win XP before I bought 7 for it.

Oh the wireless is a Netgear WGR614v9

[Recursion]

www.netgear.com get the proper drivers and then update your router's firmware.