If you want to boot from an iso file via grub, you can add a menuentry via /etc/grub. If you go this way, after updating & dist-upgrading the 32-bit system with a new kernel you must run the command sudo update-grub in the 64-bit system to get menu entries for the new kernel version. (The general recommendation is to install the bootloader to the head of a drive, /dev/sda, /dev/sdb. The 32-bit version of Windows 7 Ultimate support up to 4 GB RAM while the 64-bit version supports up to 192 GB RAM. I checked the grub bootloader of 64-bit Ubuntu, and it is not 64-bit, it works in a 32-bit computer (my old Dell Dimension 4600 with Pentium 4) even without this precaution. Windows 10 through Windows 7 are available in. If you have a 32-bit CPU, you cant install Windows 11 at all. To make it search for and find the new 64-bit version and create menu entries for the grub menu, so that you can select either of the 32-bit and 64-bit version.Īfter updating & dist-upgrading the 64-bit system with a new kernel you must repeat the command sudo update-grub in the 32-bit system to get menu entries for the new kernel version. Windows 11 is only available as a 64-bit version. Run the following command, sudo update-grub When you reboot after this procedure, you will only find the 32-bit operating system. If you install the 64-bit version after the 32-bit version, and you want to be sure that the original grub (installed with the 32-bit version) is used for booting (in BIOS mode), you should select 'Something else' at the partitioning window of the installer and at the bottom of the window install the bootloader to the partition, 'PBR', (for example to what is going to be the root partition, which might be /dev/sda3 or /dev/sda6) and not to the head of the drive, 'MBR'.

Windows 7 32 bit and 64 bit iso loader