There's no such thing as "Frontpage Viewer"
Contact the sender of the email if you can't see the pictures. If the
pictures are attachments, you need to open them in a image editor - whether
to see them or edit them, use the image editor.
You probably need an HTML-message capable email reader (eg Outlook, Outlook
Express).
The other thing, if it is an HTML email, the images might be missing because
the sender didn't host the images on his web server, and/or make absolute
URLS point to the images.
If the images are attachments, right click each one and "Save As" to a
folder you'll remember (e.g. "My Pictures" or whereever you like).
Then open them in the default image viewer in Windows and/or the Image
viewer in MS Office Picture Manager or similar.