When I try to add or change the preview borwser the program crashes or fails to take the changes even if I do all the steps correctly. I use a Mac and Dreamweaver CS4 and the problem persists even if you reinstall everything. I have to delete some files in particular? Thanks
I'm assuming that you have those browsers installed on your computer? But I guess even if you didn't have them installed, your program should not actually crash if it didn't find them...
Changing the preview browser should not make your system or program crash.