Do you have a DVDR drive and a blank disk? You could burn an Ubuntu LiveDVD (AKA 'LiveCD') Ubuntu Tutorials has instructions to create it in Windows. Would that be acceptable?
In a Windows web browser (Edge, Chrome, Firefox, IE, et cetera) go to Ubuntu's download page and pick the version of Ubuntu you want. Versions 18.04 LTS, 16.04 LTS, and 19.04 are supported here. I would suggest 18.04 LTS since it will be supported until 2023.
If you want to use a different desktop environment for Ubuntu Desktop, those are downloaded from here.
Also, download the SHA-512 checksum. Once the downloads finish, use CertUtil which is part of Windows 10 to verify the download was not corrupted.
Burn the DVD (and we use DVD instead of CD because you can't fit all of a complete Ubuntu installer onto a CD any more) in Windows by right-clicking on the ISO file of the Ubuntu installer and choose Burn Disk Image. Once burned, reboot your PC and follow the Ubuntu installation instructions.