PC-Doctor's strength lies in its ability to detect faulty hardware devices. If a physical device is faulty, it is not possible for a software product to fix it. Usually, the device requires servicing or replacement — a task best left to computer professionals. Other software products focus on addressing software-related problems such as missing DLLs, registry errors, and system crashes. These software problems can be fixed by replacing the missing DLL, restoring the registry settings, or catching the system crash before it occurs.
If a system is not operating correctly: