Very slow LAN file transfers with Vista

Just recently my LAN file transfer speeds have gone to crap for my Vista Business 64bit machine. They used to be around 10 MB/s (80 mb/s) and are now about .5 MB/s upstream and .8 MB/s downstream.

I have disabled the differential compression setting already and have also applied that Hotfix that is supposed to help with file moves/copies/deletes. Neither have helped.

My Vista box is doing the file transfers with an Ubuntu box. I have tried my two Ubuntu boxes and they achieve the normal 80 mb/s on the same LAN.

All three boxes are connected to a D-Link 5port gigabit switch.

I would really appreciate any help or suggestions anyone could give.

EDIT: Problem solved. I am going to post my solution just in case anyone else runs into this problem.

I found out that my Ubuntu box was configured to be running at just 10MB/s instead of 100 or 1000. An easy way to tell the NIC settings on a Linux box is to use ethtool. To check your info, use:

sudo ethtool -s eth0

To change those settings, look up the man pages for ethtool.

Also, if you ever notice that your LAN file transfer speeds are about 500KB/s upstream and 800KB/s downstream, then your problem may be that your PC is running at correct speeds but the remote PC is running at 10mb/s.