I moved this to LiveSafe as that is what we are talking about.
I see you are using Win 8/8.1 so a question, is it totally up to date and is Internet explorer 11 installed. It doesn't matter if you use it or not, McAfee's interface uses it and wont work properly if the browser is not up to date. So make sure it is updated.
I'm assuming you are logged into Windows as an Administrator-level user rather than a Standard one? Only the higher level can uninstall anything.
If that doesn't he;lp yhou have two choices. Contact Technical Support for help, it's free by phone or online chat and linked in my signature below.
Or simply run the MCPR cleanup tool and it will do it for you. Reboot afterwards. The only problem with this method is that your online license will still show as being in use. Customer Service, also linked below, can help with that if you need it.
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