Can't delete Files off SD Micro Card for Cyclo DS

Can anyone help me here? I have a Cyclo DS with an SD Micro card. When I connect this to my home computer to delete games that don't work or don't want anymore, the computer says the card is protected and files can be deleted. Does anyone know how to remove the write protection?

Some MicroSD adapters have Lock switches on them. Check to make sure that this lock is not on.If that is not the issue, then the MicroSD has become Corrupted. Copy all the files you can from your MicroSD, then right click on it and choose "Format". Formatting will erase all the files, but if you copy them first you can just put them back.