Before you try any of the above tips (good ones they are too) you must lower the MTU of your pc to less than 1400. Download DRTCP and use it to alter the settings. There is a netgear bulletin board with many top bits of advice
http://forum1.netgear.com/support/
Well worth a look.
Best of British, took me a week of hard graft but the results for speed and stability are spectacular.
Just to narrow it down a bit
http://forum1.netgear.com/support/vi...72c748223e1317
Let us know how you get on or if you find out anything interesting