In some cases I click on shared files and the virtual machine instantly crashes with
A problem has been detected and windows has been shut down to prevent damage to your computer.
BAD_POOL_CALLER
If this is the first time you've seen this Stop Error screen....
I recorded a video of the error and if I can find a way to edit out personal information, I will be glad to share it with the folks testing the 2012 preview. My other step is to rebuild my virtual machine (reinstall windows) and see if its because something else is corrupted. In fairness, I use it for browsing the web safely. Norton Security Suite is installed on the virtual machine.