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Hi, as you will no doubt have discovered after a few simple searches, MCI is:
Media Control Interface - Wikipedia
MCI - Windows applications | Microsoft Docs
The message is about a sound, so it appears the program is having trouble communicating via the API.
This may indicate corruption in Windows, or something else.
I suggest you start here:
Hard Disk Sentinel support
as the program appears to be licensed.
I have v5.29 on build 1809 (thanks for the detail) and no problem setting a sound alert, so it would seem it's a problem on that PC.
There doesn't seem to be a reference on their site to MCI, so you'd need to ask a support question.
If they reply the problem must be with the Windows installation, post back and hopefully someone will help.
Thanks dalchina did not know they had a discussion board.