Thank you Peter! your first bit of advice helped me --- "try copying the fonts (don't move them or non-Adobe apps won't see them) to C:\Program Files\Common Files\Adobe\Fonts"
Details for the record: I was having this issue after installing InDesign CS4 on Windows XP. I was missing Myriad Pro Regular (but all of the other myrads were intact). strange that it was missing, but now it works!
Good luck to all you Vista users out there. I heard that designers are having better luck with windows 7. Hope that's true!
Ok, now I'm having this issue too- using the CS3 suite on 64 bit vista. I've identified a couple of strange things, and I wonder if it's causing the problem?
1. when you look at the system fonts (in the control panel) ARIALNB.TTF is being listed as "open type" even though it is definitely a true type font.
2. if you do a search for ARIALNB.TTF (for example) on the C drive, the computer can't find that file -- even though it is definitely there in the system fonts folder.
this leads me to wonder if those two issues are related - since Adobe products can't find the font files. however, I don't know how to use this info to possibly solve the problem.
I just had to login to thank Mauro for providing clear instructions (that also worked) on how to resolve this missing font issue. As someone in the thread (or another I was perusing on the same topic) the Microsoft Hotfix was not a fix for those of us who do not and have not ever used Office 2007.
I'm so grateful to people like Mauro who publish their findings so that those of us who need an answer do not have to recreate a working solution!
ID CS6, MSoffice 2010, Win7x64 - the same problems. Old solutions not work.
I found a solution for myself. Regenerate in ttf by defalt all 4 arial narrow fonts with Fontlab Studio without any changes to fonts info or structure. Then install them into system (Windows/Fonts). Clean old arial narrows files before. Then do search for adobefnt*.lst on system disk. Delete those files (only .lst not .db or any other). Great! Works perfectly in all adobe apps! Shows all names in arial family submenue.