Norton PC Checkup is a free tool that Symantec offers you so you may check whether your computer is running at peak performance; of course, they also include a basic virus-scanner which checks your PC for malware or viruses. A review of Norton PC Checkup has also been published.
Download Norton PC Checkup 3.0 (from System Cleaners)11.6 MB | For Windows 7, Windows 8 / Vista / XP | Free