Here is how you can unlock the folder -- I got this answer just a few days ago from joshz in this discussion forum -- it worked!
Open /Applications/Utilities/Terminal, and paste this text in, but DON'T press enter yet.
chflags nouchg
Make sure there is one space in front of the text and type a space after "nouchg."
Now drag the affected folder into Terminal, and press enter.
After closing Terminal, go back and do the "get info" thing again.
If that does not work, repeat the process, but put "sudo" in front of "chflags". You'll need to type your admin password in that case.
Good Luck.
Message was edited by: Steve Gregorich