|If you have 2 wireless adapters on one computer, disable one of the adapters, don't use them at the same time. Also don't enable any wireless encryption on wireless router temporary, after that test to connect to wireless network and see how it goes. |
If it works, that means you used wrong WEP encryption key before. If it doesn't work, can take a look on this wireless network troubleshooting tips article, hope this helps.