Complete Computer Freeze When Web Browsing

I've just purchased a 3Com Wireless NIC ( 3CRDAG675B ) so I could connect to my flat mates SKY Broadband. I installed all the required software that comes with it (so far so good), my OS is Windows XP SP 2 by the way. I managed to connect to the router (Netgear), signal strength good etc. I launched a peer2peer program and everything was fine, strong signal, good speed blah blah blah!

I then decided to do a bit of web browsing but after about 2 minutes of browsing the whole computer freezes. I have Internet Explorer & Firefox both web browser cause the same problem.

The computer only freezes after you start using these web browsers!

I did have a Uk Online connection ( via Voyager 105 USB ) on my computer before hand but removed it before installing the 3Com NIC.

Can anyone steer me in the right direction to solving this problem!

Cheers!