I use Norton Utilities. Speed Disk, One Button Checkup, Norton WinDoctor r most used by Me. I hv NAV 04 turned off as it used to hog too much of mine resources. Machine became slow as snail. Avast 4.6 is lite and does the job. Bi-weekly optimizing Drives [Twice Consecutively] keeps my Drives Clutter free , Monthly Checkup with one button checkup and WinDoc keeps it cool. I also use SystemMechanic 5 pro with good effect. SysMech reg Clean, defrag,compact is cool.