I don't know what the program is for. I don't have it on my computer. Could be part of a program you've installed or maybe from something that came on the computer. I'm no expert, but if everything seems to be working ok, I'd just leave it blocked. You can always unblock it if you find something not working.
Did a google search for hcwemonnon.exe and found this;
HCWemmon.exe Windows process - What is it?
Hope this helps.
Gary