Vista/Win 2K Pro wireless & ethernet connection

After calling for techs 4 times with no one showing up here at the house, I'm
asking for help here. I hope someone can provide me with a direction to go or
answers. I realize this setup is screwy but am hoping to get it to work.

#1 NEW Lenovo Vista Home Premium machine
Uses a D-Link DWL-122 wireless USB adapter
Machine also has a NIC card 10/100

#2 Older machine with Win 2K Pro with a DWL-122 adapter/No NIC card

#1, #2 machines connect wireless to a Verizon Westell DSL modem via DWL-122.
I also have a D-Link DI-624 wireless router that connects to an HP 2600N
printer.

Problem:#1
#1 & #2 can see both networks but have to manually connect to one or the
other. The DSL is a new addition as I was using the DWL-122 for the printer
only. DSL connection is WEP on both and printer is open on both.

Problem: #2
I tried ethernet hookup from #1 machine to the DI-624 to the printer. #1
machine sees it but won't connect/print unless I manually connect. Plugged
into port 1 and not the LAN port. Lights are on and it works when I manually
connect it.

This is my 1st venture into wireless @ home so I'm running blind here.
Should the machines be able to connect to either network w/o manually
connecting?
Should #1 machine be able to print via the ethernet connection w/o manually
selecting the network while still using the wireless?

Lastly, both machines intermittenly drop all/either connections even though
I have 100% signal strength on both networks. Reconnect can take several
tries on either machine to connect to either network. Sometimes they'll stay
connected for hours on end & other times you want to beat the thing to pieces.

Replies are better sent to, deckert (at) owt (dot) com

TIA for any advice/help offered.........