RegBak
Using this 'light-weight' and simple utility, you can create backups of Windows registry files to a location of your choice and then restore these files at a later date. You can also use the backups created by Regbak while running the 'Windows Recovery Console', making Regbak an ideal choice for all registry restore scenarios.
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Registry Compactor
The Windows Registry grows as data is added to it, but it never shrinks when data is removed. A bloated registry with a lot of empty space can slow down the boot time as well as performance. Registry Defragmenter and Compactor will rebuild and re-index your registry to eliminate structural mistakes and corruption.
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