Game Won't Launch - Ordinal Not Found

[MerlinX]

I am trying to launch the game for the first time, and I keep receiving the following error message...

ShippingPC-BmGame.exe - Ordinal Not Found
The ordinal 5360 could not be located in the dynamic link library xlive.dll.

I sent an email to Eidos support about this and they are telling me it is because my display drivers are not digitally signed. But, I have just updated my drivers from AMD (ATI), so I don't see why this would be.

Some of my system details:

Dell Dimension E510
Windows XP (Service Pack 3)
Pentium 4 CPU 3.00 GHz
2 GB RAM
Radeon X1800 GTO
Installed the game from DVD

Would love to play this game - any ideas would be greatly appreciated!