I have a Dell PowerEdge 2950 that has 2 3.0 Ghz dual core Xeon processors, with 4 GB of Ram. I want to use VMware ESX 3.5 Server for Red Hat Linux Enterprise 5 64 bit. When I start the Virtual machine I get "Your Computer does not support Long mode. Use a 32bit distribution." I installed Windows 2003 server 64bit and it worked just fine, then I tried Red Hat Linux Enterprise 5 64 bit, and worked as well.
What do I have to do to make it work?