I have Microsoft Security Essentials, which is programmed, TuneUp - Click Maintenance to clean registry, defragment registry, remove broken shortcuts, gain disk space, optimize system startup and shutdown and defrag hard disks, Advanced System Care for quick malware removal, registry fix, shorcut fix, privacy sweep and junk files clean, CCleaner, and Malwarebytes anti malware. Some may say that I do not need so much but not one picks up everything. None are used at the same time and they all cost me nothing.