I'm not a computer person, either, but try watching a movie with no other apps open. If the sound is still choppy, Mistress is probably right -- get some more memory.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)