Commented Unassigned: Problem About registering Mapwingis.ocx [26020]

I need to your advice in using MapWinGIS v4.9.3.5 Win32.

Mapwingis.ocx is normally registered in most PCs.
But the Problem occurs when registering it in some PCs and
there is no an error message in the process of setup.

As a temporary method, I register it with Regsvr32.exe manually(CMD.exe).
Do you have any related information?
I'm looking forward to your advice.

Thank you.

Comments: Thanks Paul - We had the same issue today during an installation - I will try your suggestions at our next opportunity. Thanks for the help! Ray