Stop pasting content from Microsoft Word into WordPress as the pasted text also contains Word's own formatting. This is currently stopping your sidebar being displayed properly in IE and on the home page alone has created over 600 validation errors (which could well be some kind of record)! You're lucky that IE is still showing anything on the site! If you cannot possibly manage without Word, paste your text into NotePad (or another text editor) first, then copy from NotePad into WordPress.
For now, you'll have to go back through every post - pasting the content from WP into NotePad, deleting the content in WP, then copying the content from NotePad back into WP.