Yesterday I ran Windows Update on my Windows 7 Professional and applied KB2607712 and KB2510690.  Upon reboot all system messages and menus appeared to have changed to a wingdings font or somthing similar.  I ran the MS Boot stand-alone sweeper tool to check for malware and it came up clean.  I then was able to run system restore (tricky when you can't read anything on the desktop) and was able to restore the system back to a usable state.

Is this a known issue?