The word 'program' was used! All that you really need is to use the utility 'Disc Cleaner' I think it's called -sorry I don't have my Mac on at the moment.....it's in your Utilities folder. Once you open this, just select your hard drive and click the software button 'clean disc permissions' and then verify, that's all. Do this about once a week to keep things running smoothly.
If I have any wrong names here, I will update this post later..... Hope this helps.