Sound flickering

It happens randomly every time when processor uses approximately 50-100% of its self-power.
I already have read info about disabling all sound effects, but it has no effect for me

To partially reduce that effect I set 'low priority' to all process that consumes more that 10%..
Also I have no problems with sound, when I play it on WinXP.
CPU: AMD AthlonXP 1.8Ghz 2500+
Sound: Integrated audio Realtek AC'97 (v6.0.1.6305 latest realtek driver)
OS: Windows 7: Ultimate 32-bit (build 7600)

Any solutions?

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