There's a free download and a paid download. I dl the free one but it's just a picture (JPEG). Is this program worthwhile? I have had my iMac for about 2 years and haven't done anything at all to it. I have downloaded tons of music from various sites and put them on iTunes. I'd appreciate any advice about cleaning the hard drive. On Windows I'd use the utility that came with it and some other software disc I bought. Thanks in advance.