Library (Read Only)

Hi, I am having trouble with the library attributes. I have to update the cpp and h files in PS2 Keyboard. However if I try to over write them I can't. The attributes for all in the sketch folder are Read Only. I try to change the attribute in the Arduino sketches Properties window but it always reverts to Read Only. It means I can't copy and paste the new cpp and h files. I have deleting both and replacing but this doesn't work either. I am sure there is something I have missed but can't find it. Any solutions please.

Close all IDE's before updating?