well, IMO, IE 11 is something that is NOT to have. Some of our customers have got it within Win update, and report us that some problemes aries working with Creo 2.0 WS.
You can also try with CreoView 3.0. Avaliable at download center:
https://www.ptc.com/appserver/auth/it/esd/product.jsp?prodFamily=DVV
J.