Then you can use the native 64 bit installer instead of the 32 bit one. Because you can use the native 64 bit installer you get an option to select the architecture when you start the Windows Installer. When you select the 64 bit architecture all you have to do is select the Setup program and you will be done.
The reason why the above workaround is still required is that the floppy disk driver does not support the booting from a protected mode operating system. So the workaround is required otherwise you won't get a DOS prompt.
After doing that you can make a floppy and insert it into the VirtualBox IDE. Now when you press F9 when you start VirtualBox will take you to that windows 98 boot disk and you can boot into the DOS.
Once you have a rescue CD, boot from it and the first screen where you can choose between Windows or Linux is your workstation. To boot from a Windows 98 rescue disc, you need to press any key at this point.
Once we have VirtualBox installed we can install Ubuntu inside VirtualBox and then install all applications and files that we need to use a Windows 98 ISO or a rescue CD. Be sure to download a rescue CD for your machine, because if you have a hard disk problem (such as a crash) you might need to use a rescue CD to repair your hard disk. Windows 98 is also protected mode, but that is a matter of taste. I chose Windows 98 because it is a very popular operating system and everyone knows how to use it, and it is also capable to booting in real mode. To access the rescue CD you can use the Windows rescue CD or a regular CD/DVD drive with a rescue disc.
If you get stuck on the Windows boot prompt. Just boot your Windows 98 CD and follow the instructions on the screen. Once you get into the Windows 98 setup, follow the instructions on screen to install Windows 98. Note that it will want you to choose a location on your hard drive for the installation and since we don’t have one yet, it will want you to choose the optical drive.