It is completely frustrating. It is not an eval version of Word, it is not a networked file (it is my own file on my laptop), it is opened using Word, it has nothing to do with a CD/DVD (it was created using Word on my laptop) and none of the other possible reasons people have posted about on here. I am running Windows 7 and Word 2010 but have had this problem with earlier operating systems and software versions. After the document has been edited and saved a few times Word simply decides to make the document read-only. I don't WANT to have to re-name it, save it somewhere else, then move it later. Why should I have to do this? There must be some way to fix this problem.