Extremely poor sound quality on all apps after using Real Player!

Hi there
On my Leopard iMac (Core2Duo) I am experiencing extremely poor 'lo-fi-like' quality on all audio from all applications including iTunes, Quicktime and Safari as a result of using Real Player to play a file online.
I very rarely use Real Player and this was the first time I'd used it in months to even a year. The file was a simple RAM file from a store website allowing me to listen to a sample of a music file. When played, the quality was low but I expected this from a music sample, and from Real Player. However, after closing Real Player, I noticed the sound quality had dramatically dropped to an almost un-listenable quality.
I have restarted and uninstalled Real Player with no luck. The poor sound quality still comes through my internal speakers, as well as external speakers, so it seems like a software issue.
Not sure what to do, please can anyone help as the audio is used all day every day on this iMac!
Thank you

Just tried it as I did get iLife with my Mac. GarageBand froze for the first few times I loaded it up, then I managed to get it to work. Played with the on-screen keyboard which produced perfect sound.
Closed GarageBand, restarted iTunes, tested, working perfectly! Crystal clear sound back again!
Thanks so much for that, really appreciated!
=]

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