Most wireless access points have a security measure where you need to manually add the MAC address of a given device to the router's configuration in order to let that machine access the network. If you haven't done this already, make sure the G20 is set up properly in this respect. Also make sure you're not experiencing problems with the wireless network requiring devices with a certain minimum level of wireless security – the G20 might not be able to support it.
Another possibility is that the network stack on the G20 is damaged. (There's a chance of that if machine had Windows pre-loaded when you got it.) In that case, I'd reset the network stack. Run NETSH INT IP RESET c:reset.txt to do this. Reboot, and then run the Network Configuration Wizard to try and get back on the network. The vast majority of the time this helps clear out any lingering network issues.
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