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Here are some errors I have come across, and how to fix them.
Windows failed to boot due to password not meeting new policy settings
When setting a group policy you may set a password security that your current password does not meet. This can cause Windows to stop booting if it automatically logs in to that account. I found this happened a few times when I was setting up my machine ready for cloning.
Shift+F10 for command window
Type lusrmgr.msc to bring up the users control panel
Set the password for the account to meet policy requirements.
Click OK on cannot install window, system reboots
Should now load Windows again
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