read page 112 in you manual dust delete data is used with digital photo professional software that came on CD with camera
Keith Davis
August 2009
if you have removed lens sometime you may have got dust on sensor.
take photo of a sheet of A4 paper,look at it on pc
if it can be seen then could be that sensor needs cleaning.
best way to load images onto pc is with card reader.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix digital cameras.