Mac PDF files look entirely different on PC

I am designing som educational material in Word (version 14.0.2 ) on my Mac (OSX version 10.8.3 ). The document contains al lot of boxes and shapes with text in them. When i "print to PDF" from Word, the files look perfect on my Mac. But on all PCs I have tried, they are completely screwed up. Colors change, boxes and shapes move around and text jumps out of boxes.

Regards

Søren