All wireless routers come w/ their own DHCP server.

If you're not sure whether your PC's wire/wireless network adapter is using DHCP...

Go to Start->Run, type "ncpa.cpl" (no quotes), and hit enter. Locate the network connection, right click it, select Properties, and you'll see the details for that connection. In the list box, locate TCP/IP, select it, and hit the Properties button. Make sure "Obtain an IP address automatically" and "Obtain DNS server address automatically" are selected. Hit OK (to close the dialog box), hit OK (to close the connection properties), and the network will reset.