Internet drop-out every 30 seconds

My sister?s windows XP SP2 laptop does not work on my network: every
30 seconds, it disconnects from the network and acquires a new DHCP
address, then reconnects 5 seconds later. Her laptop works fine with
her own router, which is made by 2Wire. But we have seen other
networks where the problem occurs, such as a wireless network in a
hotel.

I replaced the old linksys router with a brand-new one (WRT45g v.3),
with up-to-date firmware. We also have the latest firmware and
drivers for her laptop and network cards

It does this disconnect/reconnect game:
* Even when set up to use a fixed IP address. It ignores the fixed IP
and gets a DHCP IP every 30 seconds!
* Whether it?s on wireless or Cat-5e ethernet. Doesn?t matter.
* Whether other wireless networks are present or not.

The services logs show this error message every time the problem
occurs:

EventID 8033
The browser has forced an election on network
\Device\NetBT_Tcpip_{bunch of hex digits} because a master browser
was stopped

We also see this IPSec error (615):
IPSec Services failed to get the complete list of network interfaces
on the machine. ... Please run IPSec monitor snap-in to further
diagnose the problem.

We?ve turned off windows firewall, IPsec, and WZC, but none of these
fixed the problem. Turning off IPSec removed the latter error, but
the main problem still occurs every 30 seconds.

Help, we?re tearing our hair out here, this has been going on for
weeks.

Thanks,
Ev

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