Blogger is Word hostile. Cutting and pasting from MS Word brings in a raft of invisible HTML codes which causes Blogger to choke. Saving from Word in plain ASCII helps a bit but someone (Blogger or Notepad or Word) turns quote marks and apostrophe's into question marks. That's a bug somewhere, both quotemark and apostrophe are in the ASCII character set, have been in ASCII since the beginning, and they should convert. Pain in the tail.
Blogger really ought to accept cut and paste from Word. It wouldn't take all that much code for Blogger to merely discard any HTML that it doesn't understand.