Weird Networking Issue

I recently installed Windows 7 Pro x64 on my machine. I upgraded the computer from Vista Business X32, pain in the arse.

I have a wireless network, very stable router. No connection issues.

I have a terabyte mirrored USB network storage on my router.

It sees it, I can access it.

I can copy files from it, and play media from it.

The problem is I can only do one of these at a time.

For example, I began copying 200 gigabytes of files back from the storage onto my computer, then proceeded to try and navigate the drive folders in windows explorer. The copy immediately threw an error, something about a lost connection.

At first I thought maybe my wireless was on the fritz, but my 3 other computers on the home network had no such trouble. The wireless connection on this computer also hasn't had any interuptions.

I then tested, I played a video from the network storage drive, and then when I went back to navigate folders Windows media player threw me an error.

I searched for a while, but all I can find are posts where users cannot see the storage, or don't have access rights.

My problem isn't access rights, it's the ability to multi-task or have multiple concurrent connections to the network, and it's not a network limitation because my Vista, XP, and Mac OS X systems all have been able to do this for years now.