It has something to do with Segoe fonts in your system.
Refer this link for solution
For Win7 a user from above link has this quote:
"I had the same problem with missing text in itunes 10.1 and windows 7 64 bit. I found the easiest fix was running this reg patch that Chris Pirillo recommended way back for Vista. Works on Windows 7 no problem. No idea about XP. See the following link: http://chris.pirillo.com/fix-windows-vistas-fonts/ for the patch link and background info."