While troubleshooting an application installation problem I was looking at the file permission for folders (directories) on the local drive. I noticed that every folder had the read-only permission box checked, but the box was greyed out. The other two options were check (not greyed out) and white (blank). When either of the other options was selected, the change did not stick; the folder would revert back to it's original setting (greyed check box).

Is this normal? I was logged in as administrator. Every machine at work that I checked was like this.