I tried different things...
As you said, I uninstalled McAfee
The drivers were already installed. That was my first guess...
I changed the parameters for the network adapter (there was no antenna category to play with)
And I changed to Maximum performance on battery. The other was already on max.
The problem is the same.
If I go 20 feet from the router, there is almost no signal (1 bar) and trying to go on the web, it runs between 0-16 kb/s
My other Inspiron 15" is running fine just besides...
Any other idea ???