You can find documentation on how to use Premiere Elements to capture still pictures with your web cam on the STEL Moodle site by logging into Moodle, then searching for STEL in the search box at the bottom of the page. Choose the course called "Student Technology Education Lab" (not the "ITS" page).
You'll find the documentation posted as a Word document under the heading Camera, CD, and DVD drivers.
These instructions have not been approved for final distribution, but your need seemed great, so I posted the link regardless.
Hope these help - if you need more information about using software or hardware on your computer, please come by the Student Technology Education Lab (STEL) in the basement of BC - room 6.