I have the latest trial version of NOD32. Every time I do a scan I get the message: "Error occurred while scanning MBR sector of the 2. physical disk. Error reading sector." The scan then proceeds normally. What is this error about and what can I do about it? I only have one physical disk, albeit partitioned into several drives, although I also have a printer with built-in card reader which shows up as a separate drive letter. Can I stop this error from appearing?