Applications :: Docx Document In Pages - Reading And Editing Files?

I've recently made the move from a PC to a Mac, and so far, everything gone very smoothly. I got iWork with my Mac, and there is one problem that's bugging me; every time I open a word (docx) document in pages, it asks me if I want to keep the changes or discard them, and that is for when I am just reading them. When I edit them, and I go to save it, it keeps bringing up the save as box instead of overwriting the present docx file.

I've already installed any missing fonts I have in my documents. So, to summarize, my two main problems are: If I read a docx file, Pages acts like I made changes to it, despite the fact that I did not. If I edit a docx file, Pages keeps bringing up the save as dialog box when I try to save, instead of overwriting the original docx file. The same thing happens with Numbers and Keynote. I just need a temporary fix 'til I can get a hold of Office 2011.