Using MSWord 2002, SP2

In my long document (55 pages) that has many pictures (100+), many of the
pictures only show a box with red X. Some pictures show just fine. I have
been working on this file for a few months and this just happened all at
once, unexpectedly.

When I checked Edit>Links I see that the pictures that don't show have a
link to the following folder:

C:\Documents and Settings\Owner\Application Data\Microsoft\Word

This is not the folder where the pictures are stored.

I usually insert the pictures with Insert, Link to File.

What could have caused this?

Is there a way to correct the links to the correct folder all at once?

How can I keep this from happening again?

Thanks for your help.

John