No worries about asking us quesitons! It's what we're here for, and who doesn't have those moments where we need to get help again?
If I were you, I would really do this using DirectRT. If you have the option, DirectRT is the way to go when assessing reaction time. I've attached an example of how you can play the video file in DirectRT and get a reaction time based on pressing the space bar. The key thing is to make sure that the video file is in a format that works with your version of Windows Media Player and to specify the desired size of the video window in parentheses next the video file name in the stim cell of the trial. For more information about using video stimuli in DirectRT, see http://www.empirisoft.com/directrt/h...ectrt_stim.htm.
I will look into these error messages you reported, but can you check to see what version you have a file named evideo.ocx? It should be in a folder named WindowsSystemFolder. Version 1.11 means you have MediaLab v2008.1.33 which suggests that you would want to install MediaLab V2008.1.33e from this webpage: http://www.empirisoft.com/download_old.aspx. Version 1.19 means you already have MediaLab v2008.1.33e installed.
Also, could you describe the details of the crash? Does it always happen in the same place or after the same item in your MediaLab files? Does it freeze on a screen in MediaLab or exit MediaLab? When do you see those two error messages?
Finally, is there a reason you use the BackSound and not the BackVideo field to play the video file?
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