Word attachment won't open

Hello, I have 2003 word, MS XP. I use a Yahoo as my default search eng. and just this week, all my email attachments will not open and I get an error message "Internet explorer cannot display the webpage"--most likely causes...etc.

These attachments are not web pages, but docs from other parties, including a test doc from my home network which is a Word doc. I have reviewed all the Internet options settings, inlcuding advanced, but to no avail. Help please