So yeah.
Yesterday I was just going through the day.
Right Clicking whenever.

But then suddenly it stopped working.
Oh, and it's a laptop.
And it's not a mouse I'm using.

And it's a Vista.

I also tried restarting the computer a couple of times.

Try checking the control panel.
Also, do you remember what you were doing between your last right click and your realisation that right click didn't work? List in as complete a detail as possible.

I was just on the forums.
Opening different tabs for each section I visit.
And then I tried right clicking the general discussion.
That didn't work.
So I tried again.
Still didn't work.

And then I tried right clicking my shortcuts.
It failed.

I had this problem, it turned out to be my mouse. Check that?

EDIT: Mine was a bit more involved. My right click had become left click, and right click no longer existed.