Hi flames16,

If it is playback and performance of the video files that is unstable it may be the performance settings in your Video-SL Setup. Could you check what you have your Video Buffer Set to and whether or not V-sync and Frame Blend are on ?
It really depends on the video files characteristics also, the video container used and the codec.
The recommended container is MP4 with the H.264 Codec for video and AAC Codec for audio.
Have you installed Handbrake for Windows with the Video-SL Preset ?
You can download here: sera.to
This is recommended for you to conform your videos to a Video-SL friendly format.
Have you analyzed the .MP4 files that you have imported into your Serato Library ? Corrupt files in your library will cause unstable playback. You need to remove all corrupt files from your library.
Could you also double check which version of Scratch Live you are using which can be found at the bottom left of the Setup screen in Scratch Live.
And lastly if you could give me more detail on your laptops video card.

Let me know how you get on and we'll take it from there.

Thanks for the reply the video buffer is set to 2g and v-sync and frame blend are both disabled tryed them on and i dont seem to get any video the format im useing is Mp4 H.264,720p,5.1Mbps;AAC 160 Kbps,48 Khz
the scratch live version im useing is 2.0.0

Intel® HD Graphics (Core i5)

Report Date: 8/1/2011
Report Time[hr:mm:ss]: 21:22:16
Driver Version: 8.15.10.2189
Operating System: Windows 7 Service Pack 1(6.1.7601)
Default Language: English (United Kingdom)
DirectX* Version: 10.0
Physical Memory: 5941 MB
Minimum Graphics Memory: 32 MB
Maximum Graphics Memory: 1696 MB
Graphics Memory in Use: 87 MB
Processor: Intel64 Family 6 Model 37 Stepping 2
Processor Speed: 2261 MHz
Vendor ID: 8086
Device ID: 0046
Device Revision: 02

* Accelerator Information *
Accelerator in Use: Intel(R) HD Graphics
Video BIOS: 1998.0
Current Graphics Mode: 1366 by 768

Hi flames16,

Do you have the direct show codecs installed ?

* FFDShow
* Haali Media Splitter (MatroskaSplitter)

Download on this link: sera.to

You need to enable V-Sync on your video card settings when using Video-SL on a Windows machine. You can read the steps for switching your video cards V-sync on here: sera.to

Try these couple of steps and let me know how you get on.

I would recommend updating to a latter version of Scratch Live also. You could update to version 2.2.2 or 2.3 will be released in the very near future.