I connect to internet through ADSL and use a USB modem
I bought a D-Link wireless router which has no USB port so I bought a ethernet modem( I have lost the driver CD)
The manual asks me to connect to the router and go to 192.168.0.1 and the type admin as user name and password empty. I do the same but it doesent move to the next page.
What do I do?
And how do I network my laptop to my desktop, both have wifi ?

So now you have a wireless router that is connected to your new modem and you have two wireless systems trying to connect to it?

If you read the details in the manual on setting up your router, you will notice that you need to have a machine directly connected to the router with a CAT5 cable in order to configure the router. You will need to connect one of your machines to the router with a cable, reboot that machine, and then follow the instructions for setting up the router.

You mean I should first connect my computer to one of the lan ports on the back. But what is a CAT5 cable? Is it the ethernet cable(i.e. the one that looks like telephone wire but is thicker?)

Yes, a CAT5 cable can also be referred to as an ethernet cable or a wider phone plug. Saying CAT5 is just one of those technically-accurate ways of saying the specific type of cable.

Just plug in the cable from one of the LAN ports on the back of the router to one of your machines, reboot the machine, and then do the configuration.