Check what your network settings are on the ipod touch. You find it from the Settings app. Choose wi-fi and you see a list of wi-fi networks. Make sure your own network has a checkbox. Click the blue > and it will give your network info. Verify you have a similar ip address (eg. 192.168.1.102) and the router is the same as your pc's default gateway.
It's possible your ipod touch is connected to someone else's open wi-fi network. If your ipod Touch can access internet services but it can't see your own pc it could be this.
Once you know your ipod's ip address from your pc run a cmd prompt and ping your ipod's address. eg. ping 192.168.1.102 and see if your PC can see it.
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