When you install VMWare ESXi hypervisor, the installer report the following error.

Error(s)/Warning(s) Found During Ssytem Scan
The system encountered the following warning(s).

Solution:
Reboot the server and go to the CMOS/BIOS setup. Navigate to the CPU section and enable the Intel Virtualization Technology.

i.e. In HP Blade server CMOS/BIOS setup -> Advanced Options -> Processor Options -> Intel (R) Virtualization Technology -> Enabled.