Please do give some more details regarding the problem..Is this issue only with the MS office application or with any other programs like wordpad, notepad etc..
Possibly there could be some virus inhibiting such tasks..check with some good antivirus software…
Coolmech is right, it sounds like a joke program possibly, which an anti-virus will remove. You could also check your mouse settings from the control panel. My mouse does not give me options as to what happens when I right-click, but for all I know this could be programmed on another kind of mouse.