id summary reporter owner description type status component version resolution keywords cc guest host 995 XP guest fails to boot Steve Using qemu and vmplayer, I created a vmdk file (and corresponding vmx) that had a complete windows installation on it. Now I am trying to switch over to virtualbox, but the machine I created using said vmdk file fails to boot. While booting in safe mode, it hung up on agp440.sys. I found this page: http://www.virtualbox.org/wiki/Migrate_Windows and went in to the system files and renamed it agp440.sys.backup. Now it hangs on Mup.sys during boot. Just to experiment, I also renamed mup.sys to mup.sys.backup, but then it hung on NDIS.sys. Not sure what is causing this as it ran fine in VMPlayer and Vmware Server. defect closed other VirtualBox 1.5.2 fixed windows xp mup.sys agp440.sys boot fail failure other other