Missing Font Commands in Vista HOme Premium

A few weeks ago, I noticed I no longer had the "Install New Font" option in
Vista. At first, thought was too many fonts, but have deleted all but the
ones I wasn't allowed to delete. No luck. I have searched/googled on anything
I could think of and even tried to rename my fontext.dll file to install a
new one but got a message I could not do this (am sole owner and user of this
comptuer). I did all the MS Dos prompts I found instructions on even tho they
were not for Vista.

Help!

Lisa