Try what ICit2lol has suggested.( I do not know whether it will work or not.
In case it does not work, Start > All Programs > Accessories > Command Prompt. Right click on it and Run as administrator.
In the Administrator: Command Prompt box against the command prompt type
each of these commands one at a time in this order (of course after each command press ENTER)
select volume n (where n = the problem volume)
attributes disk clear readonly
attributes volume clear readonly
after each of the last two you should get the response that it was successful.
( Neither do I know that this will work. Why lol only? lol.)