I've used Partition Magic with great success, it's a fine program, but it's not something to be messes with casually. As others have said, backup up your important files first, then try defragging/optimizing the disk. I don't really know what specific problem Norton is refering to, so it's hard to say whether Partition Magic will fix your problem or not. One thing to watch out for with programs like disk doctor is spurious reports to due incompatibilities or bugs. Older programs may not be able to properly detect new disk parameters, or sometimes the BIOS uses special tricks to access large hard drives. I'm tempted to say, if it seems to be working, then leave it alone. Regards- Lemurtek