Airport Express working, PC connects to network but cannot use internet

I set up my Airport Express wireless network, and all is functioning. My IMac recognizes and uses the network. My PC laptop recognizes the network (excellent signal) and "connects" or indicates that it is connected, but I cannot access the internet. Have tried the power-down and re-booting sequences suggested in other posts. Does the PC just not work on a Mac wireless network?
Thanks.

Ok, time to use the Ping tool for some additional troubleshooting. We will need to open another command window.
1. Ping the loopback address to verify that TCP/IP is installed and correctly configured on the local computer. To do this, type the following command: +ping 127.0.0.1+
If the loopback test fails, the IP stack is not responding. This problem may occur if any one or more of the following conditions is true: a. The TCP drivers are corrupted, b) The network adapter is not working, or c. Another service is interfering with IP.
2. Ping the IP address of the PC to verify that the computer was correctly added to the network. To do this, type the following command: +ping 10.0.1.3+
If the loopback test succeeds but you cannot ping the local IP address, there may be an issue with the routing table or with the network adapter driver.
3. Ping the IP address of the default gateway to verify that the default gateway is working and that you can communicate with a local host on the local network. To do this, type the following command: +ping 10.0.1.1+
If the ping fails, you may have an issue with the network adapter, the router or gateway device, the cabling, or other connectivity hardware.
4. Ping the IP address of a remote host to verify that you can communicate through a router. We did this earlier when you attempted to access Google through the web browser using Google's IP address. This time, we will try it via the Ping tool. To do this, type the following command: +ping IP address of remote host+
If the ping fails, the remote host may not be responding, or there may be a problem with the network hardware between computers. To rule out an unresponsive remote host, use Ping again to a different remote host.
5. Ping the host name of a remote host to verify that you can resolve a remote host name. To do this, type the following command: +ping www.google.com+
Ping uses name resolution to resolve a computer name into an IP address. Therefore, if you successfully ping an IP address but you cannot ping a computer name, there is a problem with host name resolution, not with network connectivity. Verify that DNS server addresses are configured for the computer, either manually in the properties of TCP/IP, or by automatic assignment. If DNS server addresses are listed when you type the ipconfig /all command, try to ping the server addresses to make sure that they are accessible.
If you cannot use Ping successfully at any point, verify the following configurations:
o Make sure that the local computer's IP address is valid and that it is correct on the General tab of the Internet Protocol (TCP/IP) Properties dialog box or when it is used with the Ipconfig tool.
o Make sure that a default gateway is configured and that the link between the host and the default gateway is working. For troubleshooting purposes, make sure that only one default gateway is configured.
o Make sure that Internet Protocol security (IPSec) is not turned on. Depending on the IPSec policy, Ping packets may be blocked or may require security.
(Important: If the remote computer that you are pinging is across a high-delay link such as a satellite link, response may take longer. You can use the -w (wait) parameter to specify a longer timeout period than the default timeout of four seconds.)

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