You are probably running a theme or otherwise set the font for active Windows to a font that is missing or damaged. What version of Windows are you running?
The easiest way is to extract them, otherwise you are into over-installing.
If you use find file and type: .CAB (*.cab in '98)
... and then, on the second line add any of the files below you will find all of these fonts in the WIN_17.CAB Folder. Just extract them with a right-click and place them into the: C:\WINDOWS\FONTS Folder.
I have 27 system fonts on this Pan-European version of ME all in C:\WINDOWS\FONTS\*.FON
Other true type fonts have a .TTF extension.
Of the 27, only 7 show, whilst the other 19 are hidden system fonts.