Well, there is no such thing as write protecting the whole system (phone and sd card). I am not sure but as far as I know, MicroSD cards don't have the 'lock' (write protect) switch on them either.
Did you try Resco yet? Additionally...the easiet way I think to solve this issue is to reflash your phone with whatever ROM you currently have or want. However, if you don't want to do that, are there any programs that you installed recently (before this issue started) that manage files or file system?
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