You might have to change one of the settings on Windows XP Media Centre. Just follow the instructions below and try running the BigPond installation CD again.
Step 1: On the main menu, select the "Settings" option.

Step 2: Select the "Messenger and Caller ID" option.

Step 3: Under "Show notifications for:", select "None".

Step 4: Click on "Save".
Step 5: Load the BigPond Wireless Broadband Installation CD and try installing again.