Startup Problem-corrupt link ?

MS 500 base on desktop w/ 520 adapter on laptop, both
running xp professional with all MS updates in place.

Upon startup, laptop shows active connection to internet
and "very good" signal strength. However, no web pages
will open until I manually disable the "wireless network
connection" and then manually enable.

After this procedure, the connection remains stable.

Broadband shows up in the startup folder, and the link
appears to be correct.

Any help is appreciated. Thanks