younata, I just read the question once again, I wish it was about why it's bad to use WEP, it is not. He clearly describes what he is doing or trying to do, and wonder why it doesn't work, he's looking for a way to make it work (crack WEP) for Evil or not Evil intention is not the point.

In no way does it explain why WEP is bad to use, suer the answers may at some extend help one to understand why WEP is bad to use. A google search on "why is not good to use Wep" is very helpful.