Install Microsoft Loopback Adapter in Microsoft Windows Server 2003

You may need to make your IP static ,  to make sure reports run well .

So you should install the Microsoft Loopback Adapter by using the Hardware Wizard, follow these steps:

1. In Control Panel, double-click Add Hardware, and then click 
   Next


2. Click Yes, I have already connected the hardware, and then click 
   Next.


3. At the bottom of the Installed hardware list, click Add a new hardware device, and then click Next.


4. Click Install the hardware that I manually select from a list, and then click Next


5. In the Common hardware types list, click Network adapters, and then click Next.


6. In the Manufacturers list box, click Microsoft.


7. In the Network Adapter list box, click Microsoft Loopback Adapter, and then click Next.


8. Click Next to start installing the drivers for your hardware.


9. Click Finish.


10. Click Start, click Settings, and then click Network Connections to verify that the Microsoft Loop-back Adapter has been installed.

Here's How to install Loop-back adapter on other windows and how to install Oracle ArabOUG

Source : How to install the Microsoft Loopback Adapter in Microsoft Windows Server 2003