I usually reformat my hard drive and reinstall everything once every 3 months anyway, just in case. And because I somewhat enjoy it. It's like taking a hot shower. I feel all nice and clean afterward.
Too true, but I do it once every 6 months. I keep mine running smooth with Tuneup Utilities 2010 and Avira Antivirus (because I can't affor ZA Extreme Security yet, and the 30 day free trial ran out. T_T)
I have, however, been looking in my registry for the entry for ZA's trial period so I can remove it and get another 30 days free, but alas, I cannot find it as I'm not good with manually editing the registry. >.>
(side note, topic is being hijacked, :p)