can you change any of the attributes of the folder?
if you cant even tamper with the attributes, you have a real problem on your hands and the answer might just be this: "fix it the Serian way:-)" (HD format and re-install windows)
But, if you can change the attributes:
try setting the folder to read-only and press ok to make the change.
go back to the folders properties and remove the read-only check and press ok.
Perhaps something went wrong and is making the folder think that it is "read-only" when there is no check(simple software problem) so, by making it 'read-only' then not 'read-only' windows will overwrite the faulty properties section of the file.
does that make sense?