I have just bought a Pentax K100D DSLR. There was no memory card with it so I purchased Scandisk 64GB SDXC card. I fitted the card and turned on the camera and just got "memory card error" come up on the screen. So being new to this type of camera I returned to Argos to get a replacement card, I spoke to a member of staff who is their "technical guy" who said that the card was incorrect for the camera, and suggested a Scandisk 32GB SDHC card, this I purchased and fitted it in the shop with the same results "memory card error". He then looked up the Pentax/Ricoh website and suggested downloading an upgrade of the firmware for the camera, from version 1 to version 1.02. I have tried to download this upgrade but without success, can anyone help please. P.S I did try an old 32Mb card and the camera worked why is this??