[arch-general] Fail to run startx

Hi, All, I followed the instructions at https://wiki.archlinux.org/index.php/Beginners%27_Guide#Configure_pacman and https://wiki.archlinux.org/index.php/VirtualBox#Arch_Linux_guests to install the ArchLinux 2012.11.01 in VirtualBox (v4.2.4). My host OS is Windows XP. After installing the base system, I tried to configure X. But 'startx' failed and I found following error messages in the /var/log/Xorg.0.log: AIGLX error: vboxvideo does not export required DRI extension AIGIX: reverting to software rendering Can anyone tell me how to fix this? Thanks in advance. Boying