If you're looking for a better defrag, check out UltraDefrag:

http://ultradefrag.sourceforge.net/

Some highlights of the software (as told on their site):

• Boot Time Defragmentation allows for defragmenting upon boot (like an antivirus), useful for system files, like the registry, the pagefile, ...
• Option to shutdown the computer once defrag has completed.
• Aside of defragging, there's also compacting, which rearranges data to the beginning of the disk, increasing performance and stability;
• Single file and folder defragmentation, in case you only need to defrag an application or files that have just been placed on disk.