I have the same problem.
I have a 1200 T-Bird CPU and ME, the sound goes choppy when I download stuff or run PSP for example.

Never happened before, on my old PC.

As a Technician I'll tell you what i'd run through to solve the issue.

1. Find out what chipset the motherboard is using. Go to control panel>system>device manager and down to system devices and double click on it. do you see any Via or SIS or Intel devices? or alternatively have a look in your motherboard manual for information of the chipset. If it's a VIA (more then likely) then go to click on this and unzip it and run it http://downloads.viaarena.com/drivers/4in1/4in1435v.zip

2. Go into control panel>system>device manager and double click on disk drives and then douuble click on your hard drive (usually it may be generic IDE disk 47 etc) and click on the settings tab and make sure DMA is enabled, click ok then go down to system devices and double click on direct memory access controller, go to settings and click on "reserve DMA buffer" and type in 32 then click ok and ok again out and let the system restart

3. Find out what your soundcard is and download the latest driver from the manufacturers website

4. Download the latest driver for your modem from the manufacturers website. If you don't know how to do any of this or don't know where to find anything pm me

5. Make sure you have the latest version of winamp

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