My "older" songs stutter when played back

my pc is only 6 months old, but the first songs i downloaded from the itunes store
"stutter" when played back. they don't stutter on my ipod, and the more recenlty
downloaded songs are also ok. i have deleted them, reloaded from the ipod, updated
itunes, all to no avail. any ideas?

First a correction. I am using the latest version of FCP – 5.
Regarding the encoding, I have tried going from native HDV MPEG-2 to H.264 at 720P from 10 to 4 MB at 24, 30 and 29.97. The Mac seems to play everything back very well, but most PCs (the latest IBM T 40 – 43 series laptops) a couple of Dell desk tops (2.6 GHZ with 64 and 128 MB graphic cards) and a 3.2 GHz Shuttle PC with a 128 MB graphic card (that we routinely use to decode four MPEG-4, 4CIF images simultaneously and display on a 42” ED Plasma) choke/stutter to varying degrees with processor utilization hitting 100%.
So, the real issue here is what is the difference between a 720p trailer that I can download from Apple and what I can output using Compressor 2 at a similar data rate – other than the frame rate?
And why does the Compressor output stutter on most PCs?

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