Yesterday I just recently downloaded SQL Data Modeler and at the end I was supposed to see a diagram but instead the ERD was only in text. I have a computer that uses an XP OS but I do have Word2010 installed. In addition, I have SQL already installed on this computer as well.
What steps did you follow? Are you trying to reverse engineer an existing database? (if so take a look at my presentation on slideshare: Reverse Engineering an Existing Database Using Oracle SQL Developer...)
Or are oyu building a new model?