@ wayrad
That is what should happen. The router will deliver the required network addresses to your computer and the iPod touch. Your computer can connect with an ethernet cable and the touch can use wireless.
If you acquire a good brand like linksys or netgear and the like you should not need special software to make it work actually you would have to find something unusual that would require software to work, some of the cheaper chinese stuff is like that but they always have windows drivers anyway also the Apple wireless routers use special software.
The router is usually configured with a web browser, you can type the router IP address into your browser like it was a web address. 207.46.170.123 is the IP address for Microsoft and is the same as typing
http://microsoft.com .
Copy and paste the numbers into your browser and you will see what I mean every address you type into a web browser has a corresponding set of numbers.
As I said earlier see if a friend or colleague has one they are not using anymore they may just give it to you. I have one not being used anymore for example.
Edit
As you have a wireless card in your pc you can of course connect with that instead of an ethernet cable.