You need permission to perform this action !!!!

Hi,

Vista RTM. New install.

I become a little bit crazy when trying to do "simple things" !
I have administrator rigths ans I disabled UAC directly after finishing
installing Vista.

Everything is installing perfectly ... right now ;-)

I just want to reinstall some data I backed-up.
So I try to paste in directory
Users\Me.domainName\AppData\Local\Mozilla\Firefox\profiles\XXXX\
.... and I receive "You need permission to perform this action !!!!".
I check "security" for the folder and I have the rights !
I can paste the files in a other directory (let's say Microsoft instead of
Mozilla) without any problems ?!?
I have the problem with some applications ...

Many thanks for help ... as I don't understand what's happening ?

Best regards

Pierre