Is the part file for the drawing open on the co-worker's machine? Is this a brand new drawing they are trying to create or an existing they are trying to edit? If it is an existing, it sounds like SW can't find the reference to the part file, which it may have lost if you moved the file form your local hard drive to a network drive.
Probably need some more details to pin down you problem.
Is the problem only with that particular part?
Can you open the part on your computer, and create the views OK?