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I recently moved a Virtualbox Win XP machine from Ubuntu host to windows host. When I started the machine I got the blue screen of death, even if I started in safe mode. I thought it might be a problem with the Virtualbox version I was running on the new host or even a problem with Windows 7 that had not been fixed yet. Since I was very careful before moving the machine I had access to all the files I needed so I put the problem on ice. Today I really needed to access some stuff on the vbox machine so I tried again with Virtualbox 3.1 version. I got exactly the same blue screen of death. No luck there. This time I was more determined to fix the issue and after a few google searches I found a really simple solution to my problem. The problem was caused by misconfiguration of the new machine. IDE controller type was set to PIIX4 instead of PIIX3. Thx to Tim Anderson. And remember to copy the XML settings file for the machine before moving, it might save you some time.