RS232 : Port error (No port found) on windows 64bits (but OK on Windows 32 bits)

Hello,

I use a com port for communication in RS232 (USB/RS adaptor). It works well on a PC with Windows 7, 32Bits.

But if I use it on a Windows 64Bits (Windows 7 or 10), I got error : "No port found".

The program finds the port to make port list (open and close), but when I want to use it (OpenComConfig + InstallComCallback), the error occurs.

Someone have an idea ?