Windows 7: Windows 7 performing simultaneous tasks on network.

This is a bit annoying. Not sure what the cause.. This very machine used to pull this off without issue both with xp and vista. Seems when I start to move a large file from one machine to another, and then simultaneously start browsing the file systems on networked computers, everything drags to a halt. I will click to open a network directory, and then wait a good 40 seconds before that directory will open. I wonder if anyone else has had trouble multitasking on the network like this. My lines should all be gigabit..

I can browse the internet while moving the file no problem. The file I am pulling to my computer, is coming from a different computer than the one I am trying to browse..

Pulling large files over a network will slow the network down..