It is pronounced POO-roo (the R is rolled). The stress in Finnish is always on the first syllable and Y is prounounced like a U. You can hear it on this site:
http://www.mikropuhe.com/demo.asp
Type Pyry in the the box and click "Kuuntele Puhe" to hear it pronounced.
[edit to add that bit about the Y]
~~~~~~~~~~~Amanda~~~~~~~~~~~This message was edited 7/6/2007, 6:41 PM