Nvidia nforce network issues with XP

Hello,
I was wondering if anyone could either confirm or indeed help.
I have got 36 new nvidia imacs (new education model) and have boot-camped (v2) them and running xp sp3. I have joined them to a Windows server 2003 domain. I have deployed software using Group Policy. The problem is all of the nvidia imacs fail to obtain the deployed software and indeed any group policies assigned to the computer part of the policies.
To test i have assigned the same policies to an OU where the older intel (white edu) imacs that we have are stored. These are successful straight away on 2nd reboot after a gpupdate /force command is run. These work as expected.
There are also problems when the nvidia machines start up. Once they get to the login window in XP if you try to login immediately you get a domain unavailable error suggesting that the connection is just too slow. This would also result in the group policies failing as they do if this is the case.
Also on the mac side they seem to take longer to obtain an IP address for connecting to the OD and AD servers for network logins and also can drop network connections randomly resulting in networked-based accounts on OS X being left in limbo and also disconnecting from shares in Windows.
I have tried changing the dchpmediasense setting in the registry as well as the gptimouepolicy setting also. Both had no effect.
Overall I'm not really very impressed with the nvidia chipset and for this sort of environment i think the Intel chipsets should be used as do other people that have worked with Nvidia network drivers.
TIA.

I installed the third-party ngo driver providec by Masayuki Murayama of Japan
http://homepage2.nifty.com/mrym3/taiyodo/eng/
Download file http://homepage2.nifty.com/mrym3/taiyodo/nfo-2.6.3.tar.gz, and carefully follow directions in file README.txt.
The instuctions are terse for those new to Solaris, so here's a (unsupported) script to help.
First create file /etc/hostname.nfo0 or (if using NWAM in OpenSolaris) add line "ngo0 dhcp" to /etc/nwam/llp or line "ngo0 192.168.0.2" (where you replace 192.168.0.2 with your IP address).
KARCH=`isainfo -n` # amd64 or i386
rm -f obj Makefile
ln -sf Makefile.${KARCH}_gcc Makefile
ln -sf ${KARCH} obj
make install
./adddrv.sh
ifconfig nfo0 plumb
ifconfig nfo0
To find out if your network card is supported, get the PCI id from prtconf -pv
For example, my card is pci10de,ab0 (nVidia MP 79 Ethernet 10/100/1000).
Here's the ngo network driver supported nVidia cards:
MCP pci10de,1c3
MCP-R pci10de,66
nForce 3 150 pci10de,d6
nforce 2 Ultra pci10de,86 pci10de,8c
nForce 3 250Gb pci10de,e6 pci10de,df
CK804 pci10de,56 pci10de,57
MCP04 pci10de,37 pci10de,38
MCP51 pci10de,268 pci10de,269
MCP55 pci10de,372 pci10de,373
MCP61 pci10de,3e5 pci10de,3e6 pci10de,3ee pci10de,3ef
MCP65 pci10de,450 pci10de,451 pci10de,452 pci10de,453
MCP67 pci10de,54c pci10de,54d pci10de,54e pci10de,54f
MCP73 pci10de,7dc pci10de,7dd pci10de,7de pci10de,7df
MCP77 pci10de,760 pci10de,761 pci10de,762 pci10de,763
MCP79 pci10de,ab0 pci10de,ab1 pci10de,ab2 pci10de,ab3
P.S., I believe the Sun-supported driver is nge, but it doesn't recognize my card--maybe it's just older cards that it recognizes.

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    > - Changing vmware network drivers from E1000 (known issue with vSphere
    > 5.1) to VMXNET3
    >
    >
    > All servers run on HP Proliant servers (blades at central office, towers
    > at schools) running vSphere 5.1. Links between the central office and
    > schools are all 100Mbps fiber via two different ISP (depending on the
    > school's location). A restart of the central office server fixes it
    > every time. I am out of ideas now and at a loss as to why this happens
    > when a WAN link goes down. We thought it was just isolated to one ISP,
    > but it was just that that particular ISP is not quite as reliable as the
    > other. We had an extended power outage at a school served by another
    > ISP over the weekend and saw the same issue with that server after power
    > was restored.
    >
    > Any ideas or suggestions at where else we should be looking? We also
    > run ZCM 11 at each school and the central office. When this happens,
    > those servers never lose connectivity with each other and with the OES
    > servers on each end. The ZCM servers run on the same vSphere host as
    > the OES servers.
    I'd get a LAN trace from both sides at the same time. At the very least,
    run tcpdump as shown below on both the central office machine as well as
    the remote machine to see how the packets differ when trying different
    things. If you do a test and do not see output on both sides, do it again
    writing it to a file and post somewhere for us to review. Note: since
    it's an SSH problem I would either NOT SSH into the system, or I'd be sure
    to limit the tcpdump capture/output to something specific to the
    connection being tested. Tracing something over which you are sending the
    tracing data is never fun since every packet picked up causes another
    packet to be generated, to be picked up, to be generated.... ad infinitum.
    To see tcpdump output with limited details on the screen:
    Code:
    sudo /usr/sbin/tcpdump -n -s 0 -i any -vv
    To write tcpdump output to a file:
    Code:
    sudo /usr/sbin/tcpdump -n -s 0 -i any -w /tmp/problem-20140408.cap
    While filtering when capturing is typically not desired, you can do it by
    adding something like 'host 10.1.2.3' to the list of tcpdump parameters at
    the end of either of those two commands. The reason filtering during
    capturing is not desired is that you may miss something.... the SLP
    traffic, DNS, ARP, ICMP error showing the exact problem, etc.
    Good luck.
    If you find this post helpful and are logged into the web interface,
    show your appreciation and click on the star below...

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