Hi Jaypeach and welcome to the site!
There are a number of things that could be causing you problems regarding your Wifi Router.
1. Your router maybe setup to not broadcast the SSID.
2. MAC Filtering. Your router could be setup to do MAC filtering and your MAC is not in the table.
3. DHCP. Your PPC maybe connecting fine but you are not getting a good IP address for your particular network.
Here are some suggestions:
1. Check your routers documentation and make sure that it is configured properly. Make sure that you disable MAC filtering and turn on SSID broadcast to atleast get connected. Once connected you can lock things down.
2. Your Wifi Router should support DHCP address leases. Make sure that the DHCP configuration on your router matches the network that you have.
3. Check out wifi.aximsite.com. This is our Wifi Guide by ikehiker of this site. It has alot of useful Wifi information that you could use.