Whenever you have a file spec that includes spaces, you typically need to put the entire filename in double quotes. From the message, this seems to be some Windows version. If you are trying to execute a command line "C:\Program Files\blah\blah.exe param1 param2" or similar, you need to specify:
"C:\Program Files\blah\blah.exe" param1 param2
and not just
C:\Program Files\blah\blah.exe param1 param2
Note that there is a space between "Program" and "Files". If the space was not there, you could skip the double quotes. Because the space is there, you need the quotes.