When I add a pdf file to word as page two (2003) the pdf is of low quality. If I print the same file independantly, it's perfect???

Let me guess - you drag and drop the *.pdf onto the page in Word?
Word is then viewing the *.pdf as an image and reduces the resolution correspondingly!

If you wish to add the information from the *.pdf to your word document, then you will need to convert it to *.doc or *.docx.

There are many converters out there if you google for them; here's one I found a few seconds ago (no idea if it's any good!).

I think you can capture the PDF pages and save it as pictures then insert the pictures in your Word document.

I'll try it.