There might, actually, be six versions of 9.0 Standalone - in the wild. (Oracle or SQL) and (Original, Update 1 or Update 2). I haven't looked, recently, to see what's available on the bOrgacle download area.
The hanging issue could be related to MANY things. System Restore, Anti-Virus, Firewall, or.....
Generally - I make every attempt to install standalones on near-virgin Virtual Machines, with AV and Firewall turned off.
(db)