I have set NOD to scan every file I download. It completes the scan and every time I get these messages: Error occurred while scanning MBR sector of the 3. physical disk - Error reading sector Error occurred while scanning MBR sector of the 4. physical disk - Error reading sector Chkdsk reports no problems - ran with it /f switch. I am not sure if the errors are trying to reference pphysical disks number 3 and 4. I have no number 4 and number 3 is a USB card reader. Any help appreciated.