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There are many computer optimization (system tuning) software available, but we have to think carefully about them before installing: do they bring more load to our computer than the speed they bring? If your computer is less than 4 or 5 years old, even has a single core processor, running above 1.5 Gigahertz, you can safely install system tuning software. I can safely recommend
PC Pitstop Optimize even for the older computers; it can clean your registy, tune Windows settings to increase your Internet connection speed, remove unnecessary files, optimize Windows for your hardware and eliminate rogue background processes, which will result in significant performance gains. However, the program does not have a defragmenter; be sure to defragment your hard disk after you finish with tuning.
Screenshot courtesy of Terry's Computer Tips.