Open an image and left click on point and the fourth function down Star Size and Halo Reduction. I used a seting of 0.6 on the sliders on this image. If you push to far the stars turn into single pixels!
Here is an extreme example slider set to 1.4 800K
http://members.optusnet.com.au/~avandonk2/E&S_1p4.jpg
Bert