Why do my folders keep reverting back to read only?

I’m on widows and trying to copy some music into a program. But whenever i try to add it it comes up with a message saying that the disk is write protected, full or the file is in use. The drive isnt full. But the files are on read only. When i un-tick this option and click ok i try again and the same error occurs. when i go back into the properties its back on read only.