Thing that flash by at startup are not always the same?

How come with a number of windows 98 machines I have no two have the
same thing coming up during the startup process? One just starts with
a windows cloud picture windows then goes black then returns before
finally I see the desktop. Another one has some screens of text on
black mixed in sequence with the windows 98 cloud picture screen. And
I also noticed that after months of a certain text on the screen one
day it had some different information in text coming up for a few days
then I guess it went back to the way it had been. All that text flies
by so fast is there a way to freeze it and be able to actually read
all of it?