HP Printer LaserJet 2100

I am connecting a laptop running Windows 7 64bits to a HP printer LaserJet 2100 on a Win NT server through work-group network. Here are my problems.

1) Problem when connecting Wireless to the network

--All other computers (running XP & 98s) are connected through hub to router to the server.

--This laptop is the only one connecting wirelessly right now.

--Laptop can not see any computers in the same network However can connect Online.(since can't see other computers thus can't connect to printers.)

Q: how can I make them see/connect to each other?

2) Problem when connecting via LAN to the network

--Laptop now can see all the computers in the network and can access the files

--However when trying to ADD Printer from network still unsuccessful. Here is what I did:

Device & Settings --> ADD Printer --> ADD a network printer --> (found the printer on network and clicked on NEXT) >> Driver Not Found

Then I tried to locate the driver manually to the driver downloaded from HP's site which updated recently in Dec. Here is the link still can not find the right .INF file to install.

It seems the Laptop doesn't know what exact .INF file it is looking for and thus failed to install.

Q: How to Connecting Windows 7 to HP LaserJet 2100 on Win NT ?

Any reply/answers to both Scenarios would be greatly appreciated. (this issue troubled me for a while now would really like to have some solution)..