Question: I just installed the latest security update on Mac OS X (installed on 2-10-2010). On restart my Mac booted in Windows 7, which I had installed previously and was set not to boot by default.

I tried to restart holding the alt key, and selected the Mac OS X partition, but still the Windows 7 partition boots. It does not matter what partition I choose, Windows 7 always boots.

I took a look in the OS X partition and noticed that the admin home folder is empty, or at least Windows is not showing any files there. There is another user on OS X and I can see their files no problem.

This has me stumped, has anyone any suggestions for a finding a solution?

Answer: 
If you install Virtual PC on your laptop, you are more or less good to go. Just copy the two files across...

Be aware that the Virtual PC console has "gone", and has been replaced by an even naffer Windows Explorer window.

You can install Windows 7 Virtual PC on versions other than the ones which support the XP Mode extensions to Virtual PC (at least, I have installed it on Windows 7 Home Premium), but Microsoft doesn't make it easy. If you go to the [Virtual PC and XP Mode](http://www.microsoft.com/windows/virtual-pc/download.aspx) download page, you can enter a version that does allow one to download XP Mode, and download and install "Windows Virtual PC".
In order to run Windows 7's Virtual PC, you'll need Professional, Enterprise or Ultimate. Home Premium won't work.

[Virtual PC 2007 SP1](http://www.microsoft.com/downloads/en/details.aspx?FamilyId=28C97D22-6EB8-4A09-A7F7-F6C7A1F000B5&displaylang=en) should work on Windows 7, but it's not "officially" supported.

[VirtualBox](http://www.virtualbox.org/) is another option if this doesn't work for you, though I'm not familiar with the conversion process.