One of the nice things about Linux is that it's really hard to mess up something as fundamental as networking as a regular user much less modifying something in your home directory. The #BASHRC# file was likely a backup or recovery file generated by some text editor and the possibility that is at all related is extremely remote.
Something you might try is issuing the following command in a terminal:
If that doesn't make things work, it will hopefully give you some indication as to why not.
sudo /etc/init.d/dbus restart
Are you certain that wireless was working before? What kind of wireless card do you have? You can determine this with the command