Install 2008 R2 on ESX 3.5 with Dell T410

If you encounter the following message when you try to install 2008 R2 as a VM in Dell T410:

Windows failed to start. A recent hardware or software change might be the cause... File: \windows\system32\boot\winload.exe Status: 0xc000035a Info: Attempting to load a 64-bit application, however this CPU is not compatible with 64-bit mode.

you need to enable virtualization technology to overcome this problem

From BIOS screen, go to Processor Settings

Change "Virtualization Technology" to "Enabled"