can you please explain how to do this?
I usually use a program called "main menu"
But if you Select "Disk Utility"
In the left hand column there will be a list of connected storage devices
Select "Macintosh HD"
Select "First Aid"
There will be four buttons to choose from
Select "Repair Disk Permissions"
Let the program work its magic.
Personally, for me, after doing the 10.4.11 Update and getting Safari 3.0, I had Safari crash all the time, I ran the permission diagnostic, found problems, fixed them, and now, no more issues.
Hope that helps you as well.