Choppy playback of some MPEG-2 files and all IFO files

[ANOther1676]

I've got Windows 7 Ultimate, and am using an NVIDIA GeForce 9500GT.
My current movie player of choice is KMPlayer, and although it plays most MPEG-2 files well (all TS files play correctly), some stutter.

Some but not all MPEG-2 files (well, 6 actually) have choppy playback; most of them are fine. KMPlayer was what I used to test the files; same result for them on Windows Media Player.

Any IFO files play choppily; no picture issues except playback is jerky - the actual picture is fine. If I convert the IFO into MPEG-2 using mpeg2cut2... well, it plays flawlessly. Not always the best solution for me, though considering I'm trying to play these as DVD files.
The IFO files were a DVD film and one of a VHS tape copied via Pinnacle Instant DVD recorder.

VLC isn't that useful to me as an alternative; it sometimes freezes on my Windows OS, even in compatibility mode, so I stopped using it.

I installed ffdshow a few weeks back, but uninstalled it today, thinking that's the issue. Not sure though if this was the right thing...

How should I fix this? This is an area which I should try to solve; had a look around the 'net but am not sure where to go, so what would you recommend?

[Baldrick]

Try play with MPCHC. It has a builtin mpeg2 decoder.

Try also use vob2mpg to make a mpg from the the dvd vob/ifo files.

[ANOther1676]

Try play with MPCHC. It has a builtin mpeg2 decoder.

Try also use vob2mpg to make a mpg from the the dvd vob/ifo files.

I've tried it; the file is still choppy. As for deinterlacing, no way to get "bob" on MPCHC?

Also, just out of interest, here's KMPlayer's Media Info on the file:

C:\my recordings\itv4 record 25 04 2011 1306 52.mpg
General
Complete name : C:\my recordings\itv4 record 25 04 2011 1306 52.mpg
Format : MPEG-PS
File size : 614 MiB
Duration : 34mn 37s
Overall bit rate : 2 480 Kbps
Video #224
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, Matrix : Default
Duration : 34mn 37s
Bit rate mode : Variable
Bit rate : 2 254 Kbps
Nominal bit rate : 15.0 Mbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Standard : PAL
Colorimetry : 4:2:0
Scan type : Interlaced
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.217
Stream size : 558 MiB (91%)
Audio #192
ID : 192 (0xC0)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Duration : 34mn 37s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Resolution : 16 bits
Video delay : 101ms
Stream size : 31.7 MiB (5%)