And I can never find the place to turn this on. I have to search for it online in order to find this feature. It's not in the Display properties anymore, where it has been in the last n versions of Windows. Instead, it is buried in the "Ease of Access Center." To turn this on, you need to:
- Open the Ease of Access Center from the start menu. (Use the built-in search)
- Click on "Make the keyboard easier to use" even though this is what you're trying to do.
- Type "Underline" in the search box in the upper right corner of the window.
- Click on the "Underline keyboard shortcuts and access keys" link.
No, this isn't really a technical or BI post, but I figure that if I'm struggling to find this, someone else probably is too. And even more importantly, the next time I build a clean Vista machine and can't remember to look in the Ease of Access Center, I can come here and find the instructions myself...
 The saddest thing is that I spend a good five minutes or more clicking through the Ease of Access Center window trying to find the actual path to this switch, and I could not find it. It's a good thing they built in search, because the features we need are often very well hidden in the UI. It wasn't until I used search to find this option that I could locate the page where it can be found.