Hello suzanne2003,
The Outlook folder where attachment opens may be full. Clear the files from Outlook cache folder OLKxx. This folder is difficult to access. Here is a way to access the folder and files
http://www.outlook-tips.net/archives/2003/20030828.htmIn Vista, the Secure Temp folder is located at C:\Users\\AppData\Local\Te
mporary Internet Files\Content.Outlook\X30M
WG3N
Hope this helps!
war1