Microsoft Word 2007 giving error for .doc files?

I have Vista and have Word installed. When I try to open a .doc file, it gives me “… not a valid Win 32 application” error. When I try to change the file association under properties, I cant find the right Word program. When I save a word 2007 file (.docx) it says it opens with “Microsoft Office Word”. But when I save a .doc file, it says it opens with “2007 Microsoft Office component” which has the word icon. I can’t find the same one that the .docx file uses anywhere.
I also wanted to add that I can still open these files by opening up Microsoft Word separately, but not by opening through an internet file or directly through double clicking the document.