OEM 10g... with 10g Release 2

Hi.
I have not installed the dbconsole on R2 so I am not sure if I am able to help you here.
But from the error message it looks like
the dbconsole is not started correctly for some reason (port conflict or unresolvable hostname)
Or
unable to connect to host looks like there is some kind of user-right issues. Is the laptop in some AD domain, and are you installing as AD user?. You would be better off installing either as AD domain admin or local admin, I think.

But, you can verifiy if the dbconsole is really started by executing emctl the following way:
%ORACLE_HOME%\bin\emctl status dbconsole.

Start it if it isn't started.
%ORACLE_HOME%\bin\emctl start dbconsole.

To be sure, you might want to stop dbconsole if started along with the database. Start it all again in correct sequence by starting the database first and then the dbconsole.
Some other issues you might look into is that the hostname is represented in the host file and is resolvable with ping. Also, verify from %ORACLE_HOME%\install\portlist.ini the you are connecting to the correct port. You also might wanna check that this actual port is not busy by another process.
Hopes this gives some help.

 

c:\>emctl status dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://oraserver:5504/em/console/aboutApplication
Oracle Enterprise Manager 10g is running.