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During the normal operation of a Windows system, registry data is constantly being written to and removed from the registry. Over time this data becomes scattered within the registry file and when information is deleted from the registry holes are left which fragment the data within the registry. Free Registry Defrag optimizes your registry by removing gaps and wasted space, thus improves the whole system performance. Note that administrator rights is required for this program to run, and you will be required to reboot after the registry is compacted.