Tablet PC "seeing" networks, but not connecting

Aaargghhh... I have a Toshiba tablet PC (Portege 3505) that I've given my teenage daughter (I got a new one for my company). It had been working with our wireless network at home, no problems. It just stopped working, although my IBM Thinkpad and my other daughter's Mac has no issues connecting.

The wireless radio light on the front panel is orange, although I made sure the switch on the side is pushed toward the "on" side. The Toshiba "sees" other networks, it just won't let me connect to them. I've made sure the WEP code is correct for our home network.

When I tried to release/renew the ip address, the message said the wireless media is disconnected. I've pressed FN+F8 (I thought maybe that was the radio on/off). No luck.

What am I missing - she is talkiing to colleges via email, will be traveling and needs to take this with her - she's in a bind!

Thanks, in advance.