I have a Dell Dimension 4700 with a 1450 wireless USB adapter.   I have a Linksys Wireless-G Broadband Router.  When we first set up the computer, I had no problems getting to the internet.  Then after about  a month, I started having problems losing my connection.  It would reconnect, work for a minute or so, then lose connection again.  I moved the computer into the room with the router to eliminate signal problems.    When I view available networks, I can see my network, but the link status says 'Associated' and if I hover over the little computer network icon, it says 'little or no connectivity'.  Any ideas?