I purchased Systweak's System Optimizer form a SAMMSOFT.com who sent me to the link to download the licensed version on Go.Zoombli.com. 28 days later I needed to again re-install the product, only to be informed by systweak that I did not purchase the extended download option and would need to re-purchase the product. This product seemed to be doing the job that I was looking for however now I can not draw my conclusion. If a person wishes to purchase this product be-warned of the pit falls and do your home work, which I will now do and should have done in the first place.