Application Development Software

Hi,
I am installing the "Pre-built Virtual Machine for Oracle WebCenter Portal Framework 11gR1 (11.1.1.4.0)" from the link http://www.oracle.com/technetwork/middleware/webcenter/downloads/owcs-portalfw-vbox-284132.html on a Windows XP 32 bit machine.

I was able to install Oracle VM VirtualBox Manager. After, that I imported the appliance - "REAVDD-HOL-WC.ovf" as per the documentation. It took about 30 minutes to perform the 3 out of 3 steps of the import process. I also observed that it while it was importing the virtual disk image from the file "REAVDD-HOL-WC-disk2.vmdk" - when about 60% of it was done, I got the below error.

Failed to import alliance "c:\Documents and Settings\user\....\REAVDD-HOL-WC.ovf".

Medium "c:\Documents and Settings\user\....\REAVDD-HOL-WC-disk1_1.vmdk" cannot be closed because it is still attached to 1 virutal machines.

Details:
Result Code: VBOX_E_OBJECT_IN_USE (0X80BB000C)
Component: Medium
Interface: IMedium {9edda847-1279-4b0a-9af7-9d66251ccc18}

Does anyone know what the error is? Could this be because I am using Windows XP 32 bit (which may not be supported)?

Thanks in Advance !