VirtualBox 虚拟机启动蓝屏重启

将装有xp的vbox的虚拟硬盘拷到另外一台机器只能进入安全模式，正常启动时总是在登录窗口处重启

进入安全模式后卸载virtualbox的addon重启后出现蓝屏重启

原因是显卡驱动的问题

参见http://www.virtualbox.org/wiki/Migrate_Windows

agp440.sys / intelppm.sys

There are a few Windows device drivers that does not play nice on VirtualBox' hardware. Many physical PC systems (and VMware) have a AGP graphics bus which will cause agp440.sys to be installed. VirtualBox' virtual graphics card is on the PCI bus and the driver will cause a system crash. The most correct approach is to boot the recovery console from the Windows installation CD and disable this service. However, it is also possible to just rename/delete agp440.sys the C:\Windows\SYSTEM32\drivers directory. Here is a knowledge base article containing more information: http://support.microsoft.com/kb/324764

A similar problem may exist with intelppm.sys, which can also cause a hang of the guest OS.