Network errors and poor throughput accessing new NAS appliance

I have a HP DV6 Laptop with 4 GB of RAM. It's running Windows 7 64 bit. Ethernet attached to my home network via a Realtec gigabit NIC.
My old NAS was a Western Digital World Book 1TB which was 100Mb ethernet attached. It actually performed adequately but I ran out of space. I replaced it with a 4TB Thecus N2310 which is Gigabit attached.
I use Wireshark to sniff the network and capture the errors and Intel NAS Performance Toolkit to measure the throughput of my NAS devices
I also have a Gateway Desktop and an Asus netbook both running Win 7 that perform perfectly against the Thecus.
I access the Thecus via Samba as a mounted drive on my Laptop. When streaming video or running NAS-PT I receive below errors and a significant loss of throughput. I should be getting about 50MB/s but due to these errors I am only getting 3-6MB/s.
TCP-Dup Ack, TCP Out-of-order, TCP Fast retransmission, TCP Previous segment not captured.
These errors are in order of predominance. The interesting part is if I boot in Safe Mode w/networking or if I boot Ubuntu I get excellent performance.
I have tried running an ethernet cable directly between the Thecus and the DV6. I still received the same Network errors but my throughput did increase from 3-6MB/s to 10MB/s (insignificant). So, it's not the ethernet cable and not switches and
not network congestion causing this problem.
I've researched the heck out of this. I've modified about every advanced network setting I could find to no avail. Totally stuck.
I welcome all questions and comments.
Thanks, Chris

Hi,
So no issues when in Windows safe mode?
Are we running any 3rd-party software that might cause the this issue, we might take use of Windows clean boot to check it out.
http://support.microsoft.com/kb/929135/en-us
Please try to pay attention to the software related to Western Digital.
Additionally, please set your network speed to duplex mode.
For more information, please refer to the following thread.
Network speed dropped from 1Gbps to 100Mbps after instlling Windows 7
http://social.technet.microsoft.com/Forums/windows/en-US/846a621b-3635-4cb9-8811-e3ac298f8461/network-speed-dropped-from-1gbps-to-100mbps-after-instlling-windows-7?forum=w7itprohardware
Best regards,

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