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Upgrading virtual box Windows 8 to Windows 8.1

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http://superuser.com – I am trying to upgrade my virtual box Windows 8 to Windows 8.1 but am getting the following message. "Your pc doesn't have enough space to install windows 8.1. Make more space available on your drive and try again" This is a virtual machine that has a dynamically allocated hard drive size. The host machine has over 300GB free space. How can I let the machine think it has more space so it will upgrade? (HowTos)