To uninstall Sprite Backup, please go into Start> Settings> System (Tab)> Remove Programs. Select Sprite Backup and tap "Remove". If you are having trouble uninstalling, please download this tool:
UninstallSpriteBackup.exe
Please copy the file to a folder on your device.
Use File Explorer to locate the file and run it
After tapping on the file please wait for an "Uninstall successful" message.
Please note you will not be able to see anything happening while the tool runs - only the Successful/Failed message.