Photo Scaling for Video http://forums.adobe.com/thread/450798
-Too Large May = Crash http://forums.adobe.com/thread/879967
-And another crash report http://forums.adobe.com/thread/973935
More information needed for someone to help... click these links and provided the requested information
Welcome to the forum.
I agree with John T., in that the pixel x pixel size of the Still Images would be the first thing that I would look into.
Next, I interpret that error message to be related to the available HDD space. His links on furnishing more info will be important there. Pay special attention to furnishing the full specs. of your I/O sub-system, i.e. your HDD's, their size, speed, available defragmented free-space, controller type and how you have them allocated.
A 90 min. DVD should NOT be over the avilable space on a DVD-5 disc.
If you DO have adequate defragmented free-space on your HDD(s), you should be able to Burn to Folder, and then use Nero, Roxio or the great, free ImgBurn, to do the physical burn to DVD.
However, if you have limited defragmented free-space, that will likely fail, as the working files required are very large.
In very general terms, PrE needs between 40 - 60GB of defragmented free-space, just to run effectively and efficiently. When one does either a Burn to Folder, or Burn to Disc, that necessary space can go up.
Also remember that as one approaches about 70% of HDD capacity, performance decreases. As one nears 100%, performance can slow to a crawl, and at 100% catastrophic failure of the HDD is a strong possibility. One should not exceed about 70%, and NEVER go to 100%.
Good luck, and please let us know more, and especially about your I/O sub-system.