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This is a very weird problem indeed.
Windows 7 system makes noticeable buzzing noise in the speakers whenever certain apps are open.I have noticed this problem at least with all browsers and Filezilla.
Searched around for a solution but so far have no any clues...

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Which applications? (use "@harrymc" in the answer) – harrymc Dec 20 '10 at 13:11

I don't think that's your operating system. More like your motherboard/hardware. If it's a sound, you can simply turn them off at the Control Panel -> Sounds.

(But I highly doubt it's a Windows 7 sound..)

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this. Onboard soundcards pick up system noise. Running an application, especially when it's cpu and/or disk intensive generates a lot of noise. – stijn Dec 20 '10 at 15:28

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