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I installed a copy of Snow Leopard on a virtual drive in a Windows 7 host. It has been working fairly well in the past few days. I decided to install the updates for OS X and now it is stuck at the gray Apple loading screen.

Is there a way to fix this? If not, how can I revert back?

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Getting an updated version of the illegal (?) kernel will probably fix it. – Ярослав Рахматуллин Mar 16 '13 at 4:49

Installing and running OS X in a virtual machine requires a patched kernel. System update will replace that PC/Virtualbox bootable kernel with a stock OS X kernel from Apple. The kernel from Apple will only boot on Apple hardware.

FYi: Running OS X in a virtual machine or on any thing but a Mac is against the Apple OS X software license.

See this post here:

Does Apple's license for OS X allow it to be virtualized on an hp pc?

And this post about the license:

Where can I read the full lion eula?

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