Windows 7: Word 2010 can't save

Well that's a weird problem I've been having for a couple of days. First, let me introduce where it all started.

So a couple of days ago I messed a bit with Word settings and found out that the defaults can be set by deleting the Normal.dot/Normal.dotm file under %appdata%/Microsoft/Templates. I did that.
However, then I noticed that after exiting Word I get this message (every single time):

If I click Save, nothing happens, Word window with no blank page and only toolbars are visible (then if I try exiting again, same message appears). If I click Don't Save, Word shuts down successfully, but after launching it again and exiting, same thing happens. And it doesn't seem that Word recreates the default Normal template in the Templates folder - there's no such file visible, even with hidden and protected files set to visible.

What is more, the dialog for Save/Save As... doesn't work. Clicking these buttons simply throws me back to the document.



Tried re-installing, repairing... Same.

None of these was something about my situation, but I found this page:
Troubleshoot problems that occur when you start or use Word 2010, 2007, or 2003
It seems that the "Delete the Word Data registry subkey " was the thing that I needed.