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Dynamically allocated means it’ll only take up space as needed, whereas Fixed size will take up all of the physical disk space allotted to it from the time of creation. Then, choose your hard disk file type, the preselected VDI option works for most things.Next, select Create a virtual hard disk now and click Create.Don’t go into the red when setting memory size. Allocate some memory for your virtual machine, go in increments of 1024, use 4096 MB if your system can handle it.Now, give your guest a meaningful name, choose the type of OS you plan to install, and that 64-bit is selected.If you don’t see the option, you may need to revisit your BIOS and either select a different option or update the BIOS. If you do, it means you are ready to install. You should see the option for a 64-bit operating system.Different manufacturers word it differently. This will appear as ‘Virtualization Technology’ and/or ‘VT-x or AMD-V’ or words to that effect.
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