It might be the network drivers on your PC are not the correct ones. When you say can hard wire, does that mean you can get an internet connection when hard wired to your network? If so try going to toshiba's site and get updated wireless drivers directly from their site. Then go into your device manager and uninstall your wireless adapter, then run the installer for the drivers you downloaded. That should do the trick, if it doesn't it could possibly be something in the wiring or you have a bad wireless adapter.
Or it could possibly mean that your router does not have a band that your toshiba can work with. Also check to see if any other wireless devices can connect to it such as; a tablet, phone, other PC, etc. If any of those are unable to connect as well, it could mean you need to do a reset on your router, or that your router is shot.