Don't paste content from Microsoft Word into WordPress as the pasted text will also contain Word's own formatting. This formatting is stopping your pages from being displayed 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 the inbuilt Paste from Word option in the Visual Editor. Or use Windows LiveWriter.
You now need to go through every post and:
1. copy the post content and paste it into NotePad.
2. Delete the post content in WP.
3. Copy the content out of NotePad and back in the post again.
4. Re-save the post.