|Do you know how to get into devicemanager?|
Look at sound/audio devices and click on update driver.
It may not work since Real Player is one of the worst pieces of bloatware ever foisted on unsuspecting PC users. The only time I ever suffered the unfortunate mistake of installing it, I had to format & re-install to completely get rid of it and get my system back clean.
Goin' Fishin' (Some day)