More WiFi woes

Hope someone here can help.
I have a 20" (white case) iMac running Leopard 10.5.1 and Windows XP Home under Bootcamp. I use bootcamp to play online games. Until I upgraded to leopard, using Bootcamp Beta I had no problems. Since upgrading my internet connection in windows fluctuates. It starts off at 11MBps and everything works fine, it then steps down to 5MBps and then eventually to 1MBps. At this point the wireless connection shows as very good, but if I am in game I get disconnected, and if I am not in game I lose access to the internet. Usually after a while the connection goes back up to 11MBps and I am able to carry on. Sometimes I have to 'Repair' the connection to force this to happen.
I have tried updating the drivers from the leopard DVD.
My connection is perfectly stable in MacOS.
When I lose connection like this I cannot access the routers config pages either.
I have gone through the threads on this forum, and I am currently trying the linksys 300N drivers suggested in one of the threads.
I will post my findings after I have time to test them.

The Linksys 300N drivers worked. I now connect at 24MBps in Windows and get no drop outs at all. Tested for about 6 hours so far over 3 days.

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