Ken.C,Have you tried swapping out the switch you have the two computers on? You could also hardset your IP addresses and use a cross-over cable if you do not have another switch. I haven't had that specific error, however I know when I was using an old linksys hub it caused odd errors similar to that as it didn't handle data collisions well. Windows 7 may be more fickle about handling errors in the data stream.Otherwise, how big is the largest file you are copying?You mentioned it was a fresh install, however did you install any Anti-Virus software already? Some Real-Time scans can definitely cough up when scanning large files.Amaranthe