I think I ruined a few flash drives trying to install PopOS, and now I can boot into it because of what I think is partition issues.

I wanted to install PopOS on my laptop, so I downloaded the ISO, used balance etcher to flash it onto a USB drive, and then my computer wouldn't recognize my drive at all. I tried to boot from my drive but it gave me the "failed to open efi boot mmx64 efi not found" error. Now I can't use my flash drive and I cant install Linux. I've looked all around for solutions, but there aren't any that work for my problem. So after this I tried to use DISKPART to just start over and try again but it says that I cant clean it because of "diskpart has encountered an error: access is denied." and then I tried to clear the formatting and many other methods to fix my drive, but nothing has worked. I know this is a big question with a lot of random variables, but I'm not super experienced with all of this and I am looking for some help. Any ideas how I could go about this?