Hi Murf

I have the exact setup you have, only exception is the OS's.. Win2k/XP Pro & XP Home (I know! but it came pre-installed & is doing what I ask of it so far!!) on the Laptop.

Am not sure how much help it is but the log on's/passowrds are pretty irrelevant as I have different log on's for each of the PC's & a Wireless connection, all with none of the problems you are receiving.

Is the Windows Firewall enabled on the Wireless LAN connection on the Laptop? if so, switch it off.
As I'm sure you are aware, if it see's the Network via Cat5 then the problem is almost certainly with the Wireless settings..
Cheers
Jelly