Wireless - two users cannot connect simultaneously

[Charles Krug]

An employee has an AT&T 3800HGV-B router at home. His new X200s can connect wirelessly to it, unless his wife has already connected. If he connects to the router before his wife, then she cannot establish a connection. His PC runs XP, hers has Vista.
CORRECTION: Both run XP -- will need to check the patch status on hers.
Our employee could connect to this router at the same time as his wife using the X61 he had earlier. The wireless settings on both his TP-Xs look the same. His & hers each use DHCP and they just verified that each has a different IP assigned. Can anyone suggest a way to re-establish domestic bliss? Thank you,
Jim
Also posted on the AT&T U-verse forum

[tilneford]

Charles,

Have you checked the wireless settings page of setup for this router to confirm the router is set to hand out more than 1 DHCP lease for anyone connecting wirelessly?

[Charles Krug]

Here's the outcome:
AT&T checked over the router, and found no settings which required change. That tech suggested three changes to the X200 -
Switch off the Bluetooth radio
Use the Windows wireless connection manager instead of ThinkVantage
Update the driver for the wireless LAN adapter (the first thing I checked, but a new update became available)
For the past couple of months, the connection is much improved, with no conflict with the other PC.
Jim