UltraDefrag - Open Source Defragmenter

UltraDefrag is a powerful disk defragmentation tool for Windows. It is the first open source defragmenter with full support of system locked files defragmentation. Actually all files including registry hives and paging file can be processed by UltraDefrag during the Windows boot process.

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UltraDefrag 5.0.0 (32-bit)

For 32-bit Windows 

NT4.0, 2000, XP, Vista, 7 – Server NT4.0, 2000, 2003, 2008

UltraDefrag 5.0.0 (64-bit)

For 64-bit Windows 

x64 Editions of XP, Vista, 7 – Server 2003, 2008, 2008 R2