Can I use a wireless router as a wireless network card for my server?

Any computer that connects to the same router, will be connected to the SAME network. WIred or wireless, they are the same!

So setting up a server is simple. Just set up a server. It doesn't matter how you connect to the router. The server will need to be setup properly as well the laptop but it will still work just fine. So forget about connecting directly with a cable you ARE CONNECTED!

You may need to better understand how a server and a network works to get all of it working, but the connection to the router is not the problem. If you want the SERVER to issue the DHCP addresses, turn off the DHCP on the router let the server issue the addresses. You can only have ONE DHCP server. Even if you let the router issue the addresses its not an issue.

--Edit--

Unless your ROUTER has a client mode (most do not) then it can not be used as a wireless bridge. There is no way to tell it to what SSID to connect into. Some routers have WDS modes which could be used to connect two routers together wirelessly as well. Unless your old B router has one of those two items, you will need a different device - like a wireless adapter, wireless bridge, etc.

Running a server on a wireless device is not a good idea, just for information, it will work but it will also be very sporadic in operation.

I'm a little confused by your question. If you can connect your server to the router using a cable, then there is no need to connect via wireless. It's already connected.

However, if you want to hook your server up to a wireless router and have that router connect to another wireless connection, then that is a different story.If your wireless router can be configured for bridge-mode or an access point, this is what you want to do. This configuration is different for every wireless router. What you really want to have is a wireless bridge, it will take a cable connection and convert it to a wireless one. Or, even less hassle is to install a USB wireless network card.

Not quite the way you want. The server should be set up exactly as any other wifi computer in your network. Use a normal wifi adaptor, not a router for the server to connect with the existing router and the rest of the network.

are you able to hook up with the internet whilst linked rapidly? if so, then make useful that the on the spot computer is setup with the comparable "SSID" and channel using fact the router. This has not something to do with any antivirus software.