USB not working on Delphi4

[PierreJCM]

Hello

Note - I copied this post here as maybe it was not visible on USB Child post...

I installed nrComm_pro on Delphi 4 pro, in order to evaluate for eventually install a registered version...
I try to make some test with USB from a MIDI-USB box, intend to use "USBIODemo" project under Delphi 4.
First I had to create a new "Unit1.dfm" as Delphi is unable to read this into text format, I build thew form according to the original DFM file.
Then I am able to run it and have a list of USB devices.

The problem is that on "Instal Driver", it sends the following message:
[2012-04-28 12:09:31] nrUsbDriver: Start WinUSB driver installation ...
[2012-04-28 12:09:34] Fatal Error: 4, Creating of temporary path is failed.

JUst for a try I did the same with a personal Delphi7 version (did not have to convert the DFM), and it worked including the communication.

The problem is that my software has been created into Delphi4, then I need to keep it and integrate this Midi-USB interface.

Thanks for your help.