Technology can be so anal....

I might have an extra beta key for Battlefield Bad Company 2 for PS3 I'll give away sometime tomorrow.  I'll probably do some contest or have a question or something to check back tomorrow if you're interested.

So I bought a new wireless router a couple days ago.  The old one finally gave up.  It was a good netgear router, never had a single problem with it.  This new netgear router on the other hand is a pain in the ass.  The old one was 802.11b or maybe g, I dunno I'm not a router expert.  The new one is 802.11n which I'm guessing is the newest type.  The guy at the store said it had a much bigger range and the main reason I bought it. 

Anywho, on to my problem.  I can't stay connected to it.  I'll connect to it, try to look at a few websites and then I get disconnected 5 to 10 minutes later.  So I diagnose the problem and repair using that option that shows up when it doesn't connect and it says the passcode is incorrect.  Incorrect?!?  Then how did it connect before.  Plus I know it's right because I'm the one who chose it.  So I clear my computer of tons of unwanted crap AVG, Norton, Windows Defender and Windows Firewall just to name a few hoping those are interfearing with my connection.  I also stop lots of programs that run in the background/during startup.  I still have the same problems.  So I'm guessing my problems have something to do with my wireless adapter or antenna?  The several other computers in my house have no problems connecting, just my laptop that has the problems.  I have no clue what to do now since I really don't know much about wireless networks and such.  If anyone knows someone who can help, PLEASE send them my way.  Oh by the way, I'm connecting with the Windows Wireless connection thingie.

Here some info about my laptop and router.

Router - WNR3500 Netgear wireless router

Laptop - Toshiba Satellite L305D laptop running Windows Vista SP2 32 bit

Let me know if there is any other info needed to help solve my problem.