As I mentioned before, I have installed Vista next to XP and I am dual-booting. I had permission denied errors when I had tried to access files and folders that were created by XP.
Anyway, today I realized that permissions I set on the top level were not really inherited at all levels. I noticed it because I use Google Picasa to organize my pictures I realized that I was missing some pictures in Picasa database. What's more, when I browse to these folders via explorer, thumbnails were not showing up.
To make sure that all files and folders inherit permissions from the top level, on the root of the drive I issued the following command:
ICACLS name /reset /T /C /L /Q
Successfully processed 261133 files; Failed processing 0 files
This is supposed to reset the permissions so that they get inherited from the levels above. This worked and I noticed that Google Picasa was discovering new pictures it was not able to read before. Thumbnails were showing up properly too.
What I am worried is that if I go back to XP, they will get lost again. I will check and see...