unlock 2gb micro sd ?

When I was trying to put more songs on my Micro SD I figured I would use one strictly for Photos and One for Music because my Phone came with two free SD cards...When I tried to delete the photos from my phone it says, "SD card locked"...I know there is a way to delete them from my computer rather than to get way too technical with the phone but I don't remember how...I just want to delete the photos. Not the music..How do I do that?