Mapped Network Drive dsconnects when uploading to the Internet

#1
We have 4 computers that all run new versions of Windows 7. Each have been connected to a Mapped Network Drive and they all connect fine to the network. Dragging files throughout windows works fine. When we try to attach a file from the network in the browser (as in a GMail message) or upload a file with FTP it disconnects us from the network and from the Internet.

This only happens with 2 of the 4 computer.
 


This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.