Don't paste content from Microsoft Word into WordPress as the pasted text will also contain Word's own formatting. Sooner or later, this formatting will stop your pages from being displayed correctly (if at all) in Internet Explorer. If you cannot possibly manage without Word, paste your text into NotePad (or another text editor) first, then copy from NotePad into WordPress. Or use a weblog client.
You will nowe need to edit all Posts and Pages where you have pasted content in from Word and remove all of the rubbish it has added to your content.