xp pro sp2 loosing wireless connectivity

Hi,

I have installed a Netgear WG511v1 wireless card into my laptop so i can
join the network at work. Thing is since installing SP2 i can open internet
explorer browse for about 1 minute then it says "this page cannot be
displayed" and when i type in an address into the bar e.g www.yahoo.com it
saysat the bottom opening page www.www.yahoo.com.

Im using WEP security on configured on the netgear smart wizard, and wpa is
disabled in windows

I remedy this by disconnecting and then re-connecting but again it does it
after about 1 minute.

Can anyone help please.

Thanks

Andy