Reinstalling MS Word 2000

I’ve had Microsoft Office 2000 (Small Business) operating efficiently on my PC for several years without any problems. The other day, without reason, I lost my MS Word capabilities. I tried, without success, to reinstall just MS Word. Then I totally deleted my Office 2000 (which contains MS Word, MS Publisher, Excel, Outlook and Internet Explorer) and reinstalled it. All programs, except MS Word, reinstalled without problem….Can anyone help me?