My sound is like echo and i can't solve the problem with realtek hd audio manager

HP G72 notebook
Windows 7 64 bit
Sound is like echo and can't solve problem with Realtek HD audio manager

It's a Qosmio X300-16M (windows 7 64bit)
I downloaded the last toshiba's sound driver (for win 7 64bit), but it's as if it doesn't contain MaxxAudio anymore... (but the file maxxaudio.dll is still in realtek directory)
It worked correctly after Windows 7 update, (that's why I tried to reinstall the audio drivers which were in the DVD... but it does not have resolved the problem.)
And all my system restore's points have been lost after a wrong bios update or something else (but this isn't a problem anymore)
Now, my computer works correctly, my only problem is that the MaxxAudio tab (from Waves Audio) in the realtek audio manager disappeared... (It just makes a better sound...)
And I just want to know if it's a curent problem or not... and if someone can fix it

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