ITunes stuttering video playback

I have a new HP laptop with Windows 8.1 64 bit. It has an AMD A4-5000 processor, 1.83Ghz with 4GB RAM and Radeon HD 8330 graphics.
When trying to play my videos in iTunes (encoded h.264), they are choppy and stuttery to the point of being unwatchable. Happens with SD and HD videos.
The exact same video files play just fine in Windows Media Player on the same computer, and they play fine on my iPad 3.
Things I have tried:
I have uninstalled all Apple software and re-installed iTunes.
I have manually installed QuickTime (I had no QuickTime icon in Control Panel after only installing iTunes).
I have installed the CCCP codec pack.
I have amended QuickTime's settings to disable Direct3D hardware acceleration, and also disabled all DirectX settings in QuickTime (i.e. "Safe Mode").
I have manually installed DirectX

OK, so I found in another thread how to enable legacy codecs via terminal, and I did that.
After that I think there was a subjective improvement the *first* time I loaded a .mov file to view in QT X, then same old stutter and lag for that file and other formats also.
FWIW, the files seem to view OK if I use VLC. But that does not help with the protected .m4V files from ITMS.
Anyone got any other suggestions?
Like I said, surely my MBP ought be able to play videos from iTunes, it used to be able to.

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I'm sure there are several people out there that are having the same or similar problems, but because I can't seem to find them with the exact problem I'm having, I thought a new thread would be appropriate....
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1. Quit iTunes.
2. Go to: Start menu > Control Panels > QuickTime.
3. Click on the Advanced tab.
4. Un-check the checkbox next to "Enable Direct3D video acceleration".
5. Open iTunes.
6. Play the video.
Does the issue occur?
I also need to get some information from the affected systems:
1. Navigate to C:\Program Files\QuickTime.
2. Double-click on QTInfo.
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5. Attach that file to an email, and send it to me. Please also let me know the results of the steps above.

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AC3 Codec.component
ACTLComponent.qtx
AppleIntermediateCodec.component
AXELplayer.qtx
DivX Decoder.component
DivX Encoder.component
DVCPROHDCodec.component
EyeTV MPEG Support.component
FCP Uncompressed 422.component
ffmpeg DivX.component
Flip4Mac WMV Export.component
Flip4Mac WMV Import.component
KinomaExporter.component
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M100 Transcoder.component
Microcosm Decode.component
MP3.component
msmpeg4v2.component
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On2_VP3.qtx
on2vp3.component
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Sorenson MPEG4 PcktX.qtx
Sorenson MPEG4 ProX.qtx
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video playback stuttering at times in several applications.
Quicktime wouldn't work either.
Until you max out your ram, you are pretty much stuck between a rock and a hard place. In the meantime, make sure you have the latest versions of
Adobe Flash Player
Flip4Mac
VLC Media Player
Perian
Movist
I'm noticing that in general it's running extremely slowly now, even with only the browser running.
Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
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We want to store the movies on the networked drive so we can easily add capacity and access them from other machines on the network. Sounds logical, right? Isn't that what these drives are for? Help! I want my Media Server!
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Hello there, Myrte.
The following Knowledge Base article covers the steps on importing content into your iTunes library:
iTunes 11 for Windows: Import music and video already on your computer
http://support.apple.com/kb/PH12493
Additionally this article provides information on iTunes compatible video formats:
iTunes: Frequently asked questions about viewing and syncing videos
http://support.apple.com/kb/ht2729
What video content works with iTunes and mobile devices?
iTunes:
Video content purchased from the iTunes Store.
QuickTime and MPEG-4 movie files that end in ".mov", ".m4v", or ".mp4" and are playable in QuickTime Player.
Video podcasts.
iTunes Digital Copies.
iTunes Store Movie Rentals (Requires iTunes 9 or later).
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

ITunes stuttering video playback

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