Answers:
Sometimes it help to run the framework setup wizard within window. You may regard as everything is set up properly, but it may not be.
Also, reboot your router. It may have need of a nice re-acquaint yourself with.
Change your WEP/WPA etc... knob. I don't know why, but sometimes I freshly transmutation the knob (and transfer it on adjectives computers) and it works for me.