Why do I often get blank frames while acquiring images using external trigger under Windows 7?

I'm using Windows 7, the latest LabVIEW and IMAQdx right now. The program was developed based on the example provided by LabVIEW. Everything ran well on Windows XP using internal trigger or external trigger. But when I wanted to run the program on a desktop with Win 7, I just cannot get the images continuously using the external trigger. Although I can get the images, the blank frames showed up very often. When I chose the internal trigger, there was no problem.
Once I thought there might be something wrong with my program. But I tried the LabVIEW example to select the internal trigger mode and external trigger mode, it had the same problem.
Is there anyone could give me some suggestions to solve this problem?
Thanks!

Hi Matt,
The images are either "all blank" or "all good".
The hardware setup is exactly the same.
The blank images are not acquired periodically.
Similar results were also seen when using MAX to control the camera.
We found a solution to this problem. But we don't know how to explain it. When we were using the 5-Hz external trigger, we thought the video mode would not affect the image acquisition and therefore we left the video mode option as default (15 fps). But when we change the video mode to 7.5 fps or 30 fps, the problem disappeared. So now if we want to get rid of the blank frames while using the external trigger, we just need to choose the video mode other than 15 fps. Interestingly, when we switch back to the XP system, the camera also acquried inconsistent blank frames if we set the video mode at 15 fps.
Thanks again for your help.
Hubert 

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