Hello,
You have mentioned that in your previous O/S's you have used a direct connection, no issues at all. Is your Windows 7 experiencing issue on a wireless or a wired connection?
For now, see if turning off power-saving mode on the network adapters would help. You may do this from
Device Manager. Expand Network Adapters, right click on the problematic adapter, choose Properties, then Power Management Tab, uncheck the boxes.
Please post an update.