Cisco 871 - Multiple wireless dropouts per miniute

Only occurs with Wireless connections, wired connection don't have this
problem.
I am getting this message on a WindowsXP sp2 (windows fw off, ZoneAlarm
on) - Compaq V2582 internal wireless adapter.
Also on a IBM thinkpad w2k sp4, USR5410 (tried upgrading the fw/sw).

[The system detected that network adapter
\\DEVICE\\TCPIP_{8AE478EE-AEB2-4204-952B-4CA03C1F3CB3} was connected to
the network, ..
Telecom, Cabling and VoIP continues...