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#11
The safest defrag 3rd party defrag tool(not the fastest though) is Defraggler from Piriform, the developers of Ccleaner: Defraggler - File and Disk Defragmentation - Free Download
The fastest, but in my opinion, too many extras, if you don't know how to use them properly, can mess something up. Plus it always phones home, and tries to get you to install their other software, is Smart Defrag from IOBIT: Best Free Disk Defrag Software - Smart Defrag by IObit
If you choose this one, only simple defrag, and don't use advanced stuff, like boot defrag, moving certain files & folders to the beginning of the disk and such, just a good simple defrag is really all Windows needs.