Hi I'll try to kep this short. Basically I have been having a problem when copying files across to my NAS server, my computer would slow right down so its pretty much unusable. This was ok, but I have just installed a new graphics card (going from a nvidia 8600gts to an ATI 3870 x2, so a lot more powerful), this now means I get the error of unidentified network and my computer is almost unusuable due to the whole network problem I mention earlier. I have tried going back to my old graphics card and the problem was sorted, but then going back to my new graphics card, the problem returned. If I unplug the network cable, then my pc speeds back up again. I cannot think of anything to fix this, I have even reinstalled windows vista, and still the same problem. I did think this could perhaps be a power issue, but I have a 600 watt psu and the reccomended psu is a 550 watt. Any ideas on what else i could try? I thought maybe buying a dedicated network card rather than using the onbooard lan, or buying a more powerful psu.

Hi, As the issue only occurs when using the ATI 3870 x2 graphic card, and disappears if you replace the graphic card with old one. I suspect it is a hardware collision issue, thus we are not the best resource for this issue. I suggest contacting AMD manufacturer, they are better qualified to assist you. For your convenience, Ive listed related website as below: ATI Radeon HD 3800 Series System Requirements http://ati.amd.com/products/Radeonhd3800/requirements.html AMD Support Home http://www.amd.com/us-en/SupportDrivers/ProcessorSupport/0,,15218_15219,00.html Note: This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.