2 Problems with AirPort Express

[kangol1223]

Hi, I curently have a dlink router, an iMac and a laptop (windows) both connected wireless, and an AirPort Express.

I have 2 problems that I can't figure out how to fix.

*Resolved 1) I can't get my AirPort Express to act as expanding my current network, rather it must create its own network instead of joining the current network.

2) I can't connect my laptop (windows) into the Airport network to Print from the USB printer hooked up to my AirPort Express.

Am I not able to make the AirPort Express expand my current network unless I have an AirPort Extreme Base Station, or is there a way to do this with my current router?
I want to have it all on 1 network and be able to print to the printer on the AirPort Express from both computers.
Am I able to do this or do I need to buy an AirPort Extreme. (This is what I have been told.)

 

[kangol1223]

I was able to fix my 1st problem. I just needed to upgrade my firmware and then I was able to use it to expand my network.

But now I am able to print to the printer from my mac but can't get it to work with my windows laptop.

It won't let me add the printer.
Anyone know how to do this well?

 

[jh2112]

http://www.apple.com/macosx/features/bonjour/
try this. should work.