trying to install Freebsd-amd64

[nmeverde at np.k12.mn.us]

I just purchased an AMD Opteron server and am trying to install
FreeBSD-current amd64 on it but am having problems.  Sysinstall on the
amd64 iso's dies when it tries to run or extract files.  I can install
5.1-R or current for i386 just fine and then try to build the amd64 source
but it keeps erroring out.  Any thoughts or pointers would be helpful.

      Thanks

               - Nick