EA4500 - Wifi Fine on Everything but my laptop

Hi - I just bought a Linksys EA4500 wireless router and I'm having some poblems.
I've set it up fine and it works, but via wifi on my laptop I'm getting close to zero download speed.  I've been to Speedtest.net and I get good ping and upload, but download is literally nothing - 0.01 to 0.1Mbps.  the laptop works fine hard wired to the router.  Everything else wifi also works fine including my iPhone5, TV, AppleTV, PS3, HP Printer....... just my laptop doesn't work.
The wifi card in my laptop is Broadcom Dual Band N.  Never had issues on any other router before.  I've tried changing wifi settings on the router and laptop and there is no change.  The router came with old firmware, so I updated it (to the online system), but still no change.
Any help would be greatly appreciated.  Thanks.
PS.  Not sure why I don't have a screen name!

hillary681 wrote:
The issue is quite isolated as it is only happening on one device. Have you updated the laptop's Broadcom Dual Band N driver? This could be driver related. Get the latest driver for your built-in wireless adapter. Also, check the adapter properties. Internet Protocol Version 6 (TCP/IPv6) should be unchecked. With this enabled, the speed will be relatively slower as IPv4 data will have to be translated to IPv6.
Check out this post to resolve your username issue: How to fix @NO_SCREENNAME@ username.
Dont uncheck ipv6 if you do then you will have no ipv6 access. Ipv6 will be needed here in the very near future alot of websites i go to already are using it. It wont make any difference anyway leaving it checked that is not your problem.

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