1. Open Windows Explorer.
2. Click on "My Computer".
3. Click on the drive where your SD card is located.
4. Right click and a drop-down box will open.
5. Click on "Properties" to display a graph showing the free space available on your SD card. If it's full or close to full, you need to delete some files or use a different SD card. If it has plenty of free space, then the SD card is not the problem.