Hi Chris,
When using a WEP password please make sure it is rather long, at least 9+ characters. And is not a word/group of words (example: marryhadalittlelamb) as these are easy to crack. Be sure to use special characters such as !@#$%^&*()_+ ...etc.
I know, "What? 9-10 characters? How am I going to remember that?". Well that is easy, just write it down on a small piece of paper, then tape it on your computer case or monitor.
You should also be able to "monitor" or see any blocked attempts your routers firewall has made, by accessing the control panel. You can usually type in 192.168.1.1 into your browser bar, than enter your router login information.