For those having trouble with networking in the 64-bit version of VMware, try adding these lines to your virtual machine's .vmx file:
ethernet0.allow64bitVmxnet = "true"
ethernet0.allow64bitVlance = "true"
and maybe ONE of these lines:
ethernet0.virtualDev = "vlance"
ethernet0.virtualDev = "vmxnet"
Use the first if you're using the AMD PCnet-32 driver, or the second if you're using the VMXNet driver.