Vista - Vista x64 Explorer crashes when copying large files using wireless

Hi everyone. I have looked all over the internet for a solution to this and I just cant seem to find anyone with the same issue so I figured I'd try here.

I just put together a new build. It is a follows.
GIGABYTE GA-MA78GM-S2H
GIGABYTE GN-WP01GS-E 802.11b/g wireless card
Western Digital SATA 640GB
4GB (2x2gb) RAM
Vista Ultimate x64 SP1
D-LINK DGL-4300 Router (firmware 1.9)

I installed the OS and loaded all the patches. All the drivers are showing as up to date when using the "update driver" option from the device manager and when I manually verify the driver dates.

I have three PCs... A = XP PC connected to my network wireless. B = XP PC connected to my PC via LAN cable. C = Vista x64 PC.

Whenever I try to copy a file greater than about 100 meg from the Vista x64 PC to either A or B using a wireless connection, Vista CRASHES. It crashes almost instantly and I never get any sort of progress indicator. It's so bad, the mouse freezes, and nothing responds. I have to reboot the PC to recover. If I plug in the WIRED connection, I can copy files of any size to either PC with no problems. As an added wrinkle, I can use the vista PC with the WIRELESS connection and pull large files FROM PC A or B with no problems. The only issue arises when I try to push a file from Vista to either XP pc using a wireless connection. The only thing I have not tried is creating a share on the VISTA PC and then push files there from the XP boxes. I guess I could try this, but I'm not sure what this would give me.

I have turned off the TCP/IP tuning. This made zero difference.

Any ideas? I'll try to provide as much info as necessary.

Thanks in advance.