Error in loading a video file using VDJ7

I am running win7 32bit, 4GB RAM, Dual 2.66hz CPU since I installed VDJ 7, I sometimes see this warning on the screen when loading a video file. Either big or small vob/mpeg file, it keeps displaying. I follow its steps when I close it down, loads the file with no waveform and plays it. And it doesn't create any effect on the show from the dancers’ side.
Can I do/repair/upgrade to stop this from happening?

Virtual IDJ
Decompressing this file in memory would require 516Mb of contiguous memory.
Your system has only a total of 864 Mb available free segments (out of the 2047Mb), and they are too fragmented to hold a contiguous buffer.
Therefore, the song will be loaded on-the-fly from the drive (and the full waveform preview will not be available).
Thanks for any suggestions.
