Asus dual band wireless card, 5ghz only gets network access

[MrHood22]

I have a Rosewill Dual band PCI wireless adapter (RNWD-N9003PCe)
http://www.amazon.com/dp/B009VKON0S/ref=pe_385040_30332190_TE_M3T1_ST1_dp_1

My router is an Asus RT-N56U
http://www.amazon.com/dp/B0049YQVHE/ref=pe_385040_30332200_pe_309540_26725410_item


I've had both of these for about 8 months and they've been working fine. Since I moved (about a month ago) I've been using the 2.4ghz band. I tried to switch to connect to the 5ghz network like I had done before I move and now I only get a local network connection, not internet.

I have...
Confirmed the drivers are up to date
Connected to the 5ghz network with my phone to confirm I get internet
Confirmed the signal is strong (4 of 5 bars)
Ran windows network diagnostics. Errors are 'The DNS server isn't responding' and 'Problem with wireless adapter or accesspoint'.
When I'm on the 5ghz network and try to connect to the router I get "Settings have been updated. Web page will now refresh.
Changes have been made to the IP address or port number. You will now be disconnected from RT-N56U.
To access the settings of RT-N56U, reconnect to the wireless network and use the updated IP address and port number."

This is how my 25/5 tests:
5ghz-
http://www.speedtest.net/my-result/3537192427
During the download tests it kept spiking up and down between 1mb/s and 9mb/s.

2.4ghz-
http://www.speedtest.net/my-result/3537203690


Any thoughts on what I can do to troubleshoot it? I don't understand why it connects to the network flawlessly but it is unable to get an internet connection.