If a Windows upgrade has ever gone sideways on you, you know how vague and unhelpful the error messages can be. Here are my go-to troubleshooting tricks when that happens.
How-To Geek on MSN
GRUB not detecting Windows: How to fix
If when you start up your PC you don't see any boot menu at all, you'll need to first learn how to make your GRUB menu appear ...
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