Centaur MT: Italics Formatting Issue & Proportional Old Style Numbers

I recently purchased the font Centaur MT Std and am using a Windows computer. I am having a problem in Microsoft Word where everytime I use italics, it bumps the next line down so that it looks like it is double spaced instead of single spaced. It is really messing up my formatting. Also, I can't seem to figure out how to make the numbers proportional old style within a style guide. I found where to change the option but it doesn't actually change anything on the screen. Any help with either of these questions would be much appreciated. Thank you.