The main cause of slow/unstable PC performance is disk fragmentation. IObit SmartDefrag helps defrag your hard drive most efficiently. With "Install it and forget it" feature, it works automatically and quietly in the background on your PC, keeping your hard disk running at its speediest. Slow down, freeze-ups and crashes will be a thing of the past. IObit SmartDefrag is 100% FREE for personal, home and small business, and 100% safe from any spyware, adware and virus. IObit SmartDefrag is designed for Windows Vista, XP and 2000.
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IObit SmartDefrag beta 3.1 
