Installation won't start!

I tried installing the windows 7 rc, which o downloaded from the windows homepage.
I want to install it on a virtual machine using the latest version of VirtualBox.
The host system is Windows XP sp3.
I mounted the iso file to the virtual machine and started it afterwards.
Then it said "windows is loading files" when it reaches 100 % the whole pc (including host system restarted).
I don't know why, or what i can do about it.

greets Larth

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