To install OBIEE 11G you need do some prerequisites :-
i) The Microsoft Windows C:\Windows\System32 directory needs to have the following DLLs.
If not it can be downloaded from internet or can be copied from a system which have these files.
ii)Install Microsoft Loopback adapter to get static ip. Detailed steps to install and configure loopback adapter can be found at the following link.
The static ip needs to entered in the host file present in C:\Windows\System32\drivers\etc folder. You need to open Notepad as an Administrator to edit this file.
Note: OBIEE 11g is IP sensitive. So you need to have static IP for that else it will stop working once the system is restarted and your ip gets changed.
Check if the Loopback adapter is properly installed on your system.
Open Command Prompt ---- ipconfig
iv)Make sure the path of your Temp folder does not have any spaces. Else create a new Temp folder in C:\ drive and set the same path in environment variable.
v)Stop the firewall while installing OBIEE 11g