Try different screen resolutions such as capturing at 16K
colors and not 32K. Each slide can have a default resolution, Look
at the Properties of a typical slide and it should be at
"Standard." Now change that to "Optimized" or "JPeg" Your file will
get larger, but your resolution will increase.
Are you recording in full motion? I never do that. I always
turn off full motion recording because the files become frame-based
movies and they become extremely large. There is a time and place
for full motion video, but not in software simulations.
As noted above, try manual capture mode by pressing the PrtSc
key as needed.
Joe C.