Mpeg-4 stutter freeze on laptop 1, laptop 2 plays fine- why?

[sevenofone]

ok guys,

Got 2 laptops, both same proc/memory spec. Both Vista prof 32bit same service pack. Same players, VLC & WMP versions. Settings on players the same. The mpeg-4 file plays perfect on one, the other one freezes every few frames etc. driving me mad. What can I try? The media info is here:


General
Complete name : \VID00030.MP4
Format : MPEG-4
Format profile : Sony PSP
Codec ID : MSNV
File size : 102 MiB
Duration : 1mn 34s
Overall bit rate : 9 103 Kbps
Encoded date : UTC 2010-01-05 18:24:48
Tagged date : UTC 2010-01-05 18:24:48

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=10
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1mn 34s
Bit rate mode : Variable
Bit rate : 8 967 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.324
Stream size : 101 MiB (99%)
Language : Japanese
Encoded date : UTC 2010-01-05 18:24:48
Tagged date : UTC 2010-01-05 18:24:48

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 1mn 34s
Bit rate mode : Constant
Bit rate : 132.3 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 1.47 MiB (1%)
Language : Japanese
Encoded date : UTC 2010-01-05 18:24:48
Tagged date : UTC 2010-01-05 18:24:48

[davexnet]

Open the task manager in each and see if anything else is using up the CPU.