I installed Beyond the Sword expansion and I've found that the game will CTD every time I click on any of the New Wonders (BtS sub-menu) in the Civilopedia.
I'm using version 3.03 (latest)
I've also got the Warlords Expansion installed as well.
Windows XP service pack 2
Intel Pentium 4HT 380 GHz - Dual Core
Nvidia Geforce 8800 GTS (320 MB) Driver - 163.44
2 GB System Ram
Xear 3D on board sound