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Feb 15, 2016 4:05 PM in response to arq.afby Loner T,El Capitan BCA can fail after reducing the OS X partition, before it creates the Windows partition in the space freed up.
The simplest and safest method to get your disk space back is
1. Backup OSX and all your files - Use Time Machine to back up or restore your Mac - Apple Support .
2. Boot into Internet Recovery (Command+Opt+R) - OS X: About OS X Recovery - Apple Support .
3. Click on Utilties -> Disk Utility and Erase your internal whole disk.
4. Restore OSX and your files - Use Time Machine to back up or restore your Mac - Apple Support .
This requires a separate external disk which can accommodate TM backup - Backup disks you can use with Time Machine - Apple Support .