I install Youtrack on a clean windows 2008 R2 (no previous youtrack version). the port is 8090.
when I browse to localhost:8090, it takes about one or two minutes and the server not found message is shown.
in event log of windows an error is logged:
Log Name: System
Source: Service Control Manager
Date: 8/19/2013 3:34:12 PM
Event ID: 7034
Task Category: None
Description: The YouTrack Web Server service terminated unexpectedly. It has done this 1 time(s).