Ubuntu Servers :: Natty Apt-get Update Hash Mismatch?

I keep getting a very frustrating error after reinstalling 11.04 on a 64-bit server:

Code:
W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_natty_universe_source_Sources Hash Sum mismatch
which follow
Code:
bzip2: Data integrity error when decompressing.

[Code]...

I originally installed 11.04 on this system with the same disk so I'm confused as to what is happening. I have tried using different CD's and even installed of a USB. The memory test of the installer came back okay. The box has two PCI NICs that are recognized and functioning. The only package I have installed is openssh as this is a headless box. What makes this even more odd is that I have a newly installed 32-bit 11.04 server with the same procedure on the same network and it does just fine.

I hope I have been thorough enough in my search and investigation that someone can point me in the right direction. After reinstalling 3 times I am at a loss and I know 11.04 can run on my box without problem (as it did before the reinstall).Tonight I'm going to reinstall with the built in interface unplugged and the two NICs removed, I'm hoping this will prevent apt from bricking itself during the install, which is the only think left I can think of. I suspect the issue has to do with the nic despite it appearing to function properly I am unable to uncompress the archives in question on, my workstation, when they are downloaded on the sever but can successfully uncompress the same files when downloaded on the workstation.

SOLUTION: I pulled both NIC's and enabled the integrated interface and it is all working. I wonder why they didn't work though...