Regarding error of not getting 64 bit in your system,please follow the below steps.
This problem of not getting the 64 bit is because of the virtualization problem.
You need to activate the intel virtualization in your system for that.
The steps to activate the intel virtualization is given below.
1. Reboot your machine .
2. Before your machine starts loading your operating system, press F2 (or button which says
3. This opens Bios settings on your machine.
4. You may find an option in your BIOS named Intel virtualization or Intel vt-x.
5. Enable it and save
You may also refer the below video to change the bios setting.
Note: The steps given above to enable the bios setting may vary depending on the laptop or system which you are using.