I'll jump in here and stand corrected by one of the experts if necessary.
You're in the wrong directory when you issue the Flirc commands when using flirc_util.exe. Make sure you run flirc_util from the directory in which is resides. In your case, it looks like that is C\Program Files (x86)\Flirc.
Thus, if you want to run a "keys" command, then type, without the quotes, "flirc_util.exe keys" from the prompt C\Program Files (x86)\Flirc. You're trying to run the command from C:\Users\Clive. That's not where flirc_util.exe resides.
I'm a noob myself. I just figured out how to run this utility.