if you can't sort it ... don't panic
BEFORE you get too drastic you need something like the knoppix boot disc
http://www.knopper.net/knoppix-mirrors/index-e n.html
boot from that ... and you'll be able to access your documents and copy them to usb (if they are still there
then
you need a couple of usb memory sticks and backup to each one at the end of every day.
if no joy
when you get back get the computer department to help you recover
be aware
reinstalling could well clear the documents folder