We'd love to help! In order to delete these files, we would have to access the application in which they are saved onto. An alternative to freeing up space on your memory card is to format the SD card which will delete all information saved such as music and photos.
In order to do so go to Settings>SD Card & Phone Storage>Format SD card. To clear out pics individually, access your gallery and select the photo you wish to delete and select the menu key. You will then be prompted to delete that particular photo.
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