McAfee is founded in 1987 by John McAfee. It’s Ameican global computer security software company. McAfee is oldest, reliable and best antivirus, specially for internet users. It’s headquarter in Santra Clara, California, USA. It’s world largest dedicated security technology company. In 2011 Intel purchased this company and know it’s part of the intel security division. After McAfee activation on your device your system will be automatic scan. If you have not enough memory or space so your system may be slow down. McAfee security scan plus is a free diagnostic tool for your system.