On a new Dell Optiplex 755 system the lan adapter is failing. It has some ntel 82566DM-2 Gigabit adaptor connected. When I had hooked my internet on that there is a constant dropping in the connection. The download fails in between. I had kept some files on download through torrent. The file size is just around 200mb and still it shows long hours to download on a 512kbps link. It is very annoying. A number of time I get a popup on the screen saying that Vista is connected to some network. How can I get rid of this problem. I was no hoping to get this issue on a new vista system. Thanks.