Some of the users of one of our DNN sites are having trouble uploading files.  Randomly they will login, upload the file, attach a link to the file (usually pdfs), and try to visit it.  When they click on the link it tells them that ADOBE, or whatever program associated with the file they uploaded, could not open the file.  When I log on to the server and look at the file it will show with a file size of 0.  When I have them try again it will work fine.

I think the problem is associated with the machines they are using.  They are both on laptops that are running rather slow due to having a lot of applications running.  My assumption is that it is some kind of a timeout or something, but I thought I would ask the DNN guru's if anyone else has seen this.

Both Notebooks are running Windows XP and are on the same network as other machines working without issues.

EDIT: Just so we are clear, there are no time out messages, it's just a hunch based on the fact the process completes without any actual content in the files and because it doesn't happen all the time.