Hi Gordon1937,
Have you made any changes on the computer?
Method 1-
I would have you refer the articles-
**How to enable and configure the fax service in Windows XP**
**How To Add Components and Programs to a Computer in Windows XP**
Method 2-
You need to perform a System Restore to undo the changes made on your computer.
Refer the article-
**How to restore Windows XP to a previous state**
Note: Performing a System Restore will undo any changes made on your computer earlier. You may also lose unsaved information as well. Proceed at your own risk.
Hope this helps!!