Does XP SP3 break wireless?

Hi,

I'm having a problem with both a Netgear WG311 V3 and a Linksys WMP54G v4.1
wireless cards on a XP Pro SP3 PC, where they can see, get a strong signal
from, and connect to the router with WPA2 PSK AES encryption, but fail to get
an IP address despite numerous repairs, IPCONFIG/RELEASE/RENEWS, etc.

The Netgear card is out of warranty, so I did not get far with Netgear tech
support.

Linksys engineering, however, said flat out that the problem is due to SP3,
and they do not have a fix for it as of yet.

When the Linksys wireless monitor cannot connect, it displays a specific
error message: "the internet cannot be found". When I google that as a
phrase, I'm finding many other complaints about this.

I'm surprised. Here we are over a year since SP3 was released, and there
still is no fix?

While I await further info from Linksys, is Microsoft aware of this, and do
they have any fixes or a way of troubleshooting this to determine what
exactly the problem is?

Thanks in advance.