There is a tool called Speccy. I went to the CPU tab in Speccy and checked whether virtualization is "Supported, Enabled". Originally it was "Supported, Disabled", so I went to BIOS --> Security menu and enabled virtualization. In my Lenovo Thinkpad, F12
brings the BIOS.
Enabling virtualization helped me to overcome this error. Other answers here recommeds to check "Hyper-V" also.