sagarhshah,
What clarencepc said may help but if it is an AHCI issue it would usually fail to test at all not at sector 149 million. Using PC-Doctor from different OEM machines may give you erroneous results. Each OEM system has customizations for their particular hardware platform that may not translate well to a different machine.
If your system is licensed for PC-Doctor from the manufacturer you should go to their website and download the DOS version for your machine. If it is not licensed, I’m sorry but I can’t help you.
-Fred