It's a win2k box, with the latest servicepacks and fixes. The machine I'm copying from is a Windows XP Pro laptop.
I swear, nothing was being used at the time. It gave a "Cannot copy file : may be in use" error. It wouldn't let me copy *some* .tar.gz files, some zip files, and some executables...even one .php file! I swear, was the stupidest thing ever.
I had accounts on both machines with the same username and passwords. On a 100 base T switch. Simple filesharing, read only. That's all there was, there ain't no more. I havn't had a chance to try again since, so I don't know if restarting mattered or not.