I installed VMware ESXi 4.0 on my new Dell Poweredge R710 server. I then created a Windows 2008 Server virtual machine and proceed to boot from the installation DVD to install Windows. I was quickly greeted with this error:
Info: Attempting to load a 64-bit application, however this cpu is not compatible with 64-bit mode.
I forgot to enable Virtualization Technology in the BIOS. Dell has this disabled by default. Reboot and press F2. It is under the Processor settings.