Copying a file across the network.

I've run across a rather difficult problem to solve. I'm at the point that I don't care how the solution comes, so long as it works. I need to be able to upload/copy a file (potentially as large as 1gig) from a user's machine to this local network. I've exhausted my efforts trying post uploads, and have decided that is not the path I need to go. Then I thought I might use the administrative share to copy the file from the local network, but unfortunately some of these machines are win98 and some are win2k. The win98 machines do not contain an administrative share, thus making that solution impossible. Does anyone have any suggestions? I'd like to keep the code as much PHP as I can, allowing me to insert some data into the SQL server at a later time. I wouldn't mind a JavaScript/PHP combination if anyone has any recommendations. Thanks, Ryan