I'm having a strange problem that I only had once before and was unable to fix on Windows 7. Now I'm getting the same issue on Windows 8. Last night I downloaded the font Roboto (used by Google for their Android UI) and all of the weights installed properly, except for the Regular and Regular Italic weights. Trying to re-install the weights prompts a query if I want to replace them. Under the Control Panel's Fonts area, there are two ghost-like icons that would indicate the presence of the missing weights, and when I check for the fonts using "\\localhost\c$\Windows\Fonts" I see them there (all copies). Furthermore, despite being the Administrator of my computer, I can't seem to delete them from this area. All my hidden files are turned on, so I'm not sure what else to do. Please see the photos below for visual description of what I've been talking about. Does anyone have any other ideas? This is really frustrating me. Thanks!