failed to start Realtimekit Scheduling Policy Service. See 'systemctl status rtkit-daemon.service' for details.

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hello to all, i had windows on my Toshiba Satellite C655 and i want to switch to Linux. I downloaded the file 'Fedora-Live-Desktop-x86_64-20-1.iso', burned it and put the disk in the computer - boot manager set to start from the cd drive, the installation seemed to start but after a while i got two lines printed on my screen:

[ OK ] Started Accounts Service.
[FAILED] Failed to start Realtimekit Scheduling Policy Service. See 'systemctl status rtkit-daemon.service' for details.

please help me, thanks