This is by desing of the start program. Start ["title"] program
If the first parameter has quotes, it is assumed title.
Try editing your command to

start /min "" "Program Files...

There was a mistake in startup, the actual script was missing from command line:
When using with the windows Tas Scheduler, you place
C:\Windows\System32\wscript.exe
as executable and the rest of...

For running the program minimized using the cmd.exe /C start /MIN, the focus of the window still changes since the first cmd.exe is launched in a real window. You can avoid this by using the vbscript...