Several questions here, but first the background.  Used to use a Linksys wireless router (n) until it didn't seem to work well anymore.  Replaced it with a D-Link that advertised great power and range but it seems to disconnect us too often or lose its link to the Internet (via Comcast) and its signal only shows two or three bars on my laptop.  Then, I added a Netgear "range extender" that plugs into an electrical outlet.  For the most part this returns a signal strength of five bars, but again too often my wife's MacBook Air has trouble connecting; too often we lose the Internet and need to reboot the D-Link or the Netgear.

We live in a condo with two levels.  The wireless router is on level one right next to and tied into the Comcast router.  We do all of our wireless computing on level two.

Now, D-Link is advertising a new PowerLine AV + Mini Adapter Starter Kit.  I'm wondering if I should buy it to replace the Netgear range extender, or if it would be wiser to just find a far better wireless router. Or...? 

Any opinions you can offer will be appreciated.

Last question: what should I do when I get a message about an IP address conflict?  I've ignored these messages because I have no idea what I should do.  I get this message about once a month.

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