I have installed virtualbox on my laptop, Windows 7 (service pack 1) 64-bit, succesfully. I was also able to load linux (ubuntu 64-bit) succesfully. I then tried to repeat the process on my desktop with the same setup as the latop. However, no 64-bit option to load the guest OS. I downloaded the 32-bit ubuntu, still no luck. The same problem happended on a 64-bit laptop with Windows 10 on. What can the problem be and how can I correct it.
Greetings
WJO