RealPlayer10 no sound

[Barry Yu]

F8 64bit with intel cpu, realplayer10 plays video without sound, same system both xine and mplayer working with sound.
have noticed that in Preferences-Hardware-Audio driver showing ALSA, click on drop down arrow showing OSS and ALSA.
How can I completely remove realplayer10 from the system so I can install realplayer 11 without conflict between realplayer10 ?

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