The reason the ISO image is presented as a WINRAR file is actually because due to the .iso file type you mapped to WINRAR… this is NOT a problem.
Get an ISO image like “Ignore Ubuntu” it looks like a WINRAR file, unfortunately run the XBOOT app, point it to an external hard drive, tell it to put GRUB4DOS, pull the Ubuntu ISO you just downloaded into the XBOOT window and let it done.< /p>
Now try booting from an external drive.
Just because the system can’t boot from the USB stick, it does NOT mean it can’t boot from the USB stick … a USB drive is called a “removable drive” in older BIOSes
Stop the download and start it to restoreInstall it and select “Save as File”… . ] Select “Save As” in WINRAR, but that’s probably the quickest way to start over.
Oh, and I hope you’ve accepted the latest 32-bit version of Ubuntu and that you’re not done with 64 yet -bit version.