Assuming this ia the home product we are talking about you can use the MCPR product removal tool listed HERE and that will remove all remnants of anything "McAfee" as long as no Enterprise (Business - Corporate) software is involved.
Be careful that this version you are looking at is genuine...i.e. the seller is legitimate. That said it's good to shop around as prices vary wildly. Even McAfee themselves are sometimes cheaper than retail when they have special offers going.
Online subscriptions with McAfee have the advantage of being continuous as long as you renew you shouldn't ever need to uninstall anything under normal circumstances.
Moved provisionally to SecurityCenter 10 - 2010 as a better spot for attention.