Bootcamp Installation Error

Hello all,

Recently I was using Windows 10 on my macbook air 13 inch early 2015 (high sierra 10.13.3) and it got to a point where Windows no longer opens, only black screen. So I end up deleting the partition disk and restored to a single volume. Later I've tried to re-install it via bootcamp then got an error saying "Windows could not parse or process the unattend answer for file pass [specialize]." I couldn't find a solution to it so I deleted the Windows once again and re-download a new ISO file from the Windows' website link. Once again I've tried to install Windows 10 via bootcamp and this time before the installation completed I've got an error which was saying that I should do a first aid on my main disk. I did and everything seemed to be fine. But now there's a disk named "CCCOMA_X64FRE_EN-US_DV9" underneath Macintosh HD, which I believe the ISO file I downloaded since they have the same file size. Now I can't erase that CCCOMA disk no matter what I've tried. I need to be able to somehow erase that disk and download Windows 10 because I was working with a program that I don't have on macOS sadly. This all happened in about 2-3 days so it's really frustrating that one day everything is fine and the other day everything is messed up. Thanks for any suggestions and help.