Windows 9X : "Cyrillic Support for win9x".
Windows NT4.0 / Windows 2000: "Cyrillic Support for win 2000 / NT4.0".
Generally, World Wide Web uses 2 methods to show you a text on your screen:
Hypertext pages - main Web pages, such as some Home Page.
For example, a page of Yahoo! search - http://www.yahoo.com/index.html.
Plain Text pages, such as a screen showing a directory of files, for example, one at the Microsoft FTP site - ftp://ftp.microsoft.com/ or a screen showing a content of a plain text file in this directory, for example, file dirmap.txt: ftp://ftp.microsoft.com/dirmap.txt
Each type of a page requires its own type of font to be used in your browser:
Proportional width fonts - for Hypertext pages (Netscape 4 uses different name - Variable width fonts)
Fixed width fonts - for Plain Text pages.
So, you need at least 2 Cyrillic True Type fonts in your Windows: Proportional and Fixed fonts for Windows 1251 encoding ( 1251 encoding - Microsoft name for cyrillic encoding in windows )
Standard Microsoft Cyrillic fonts are available on all modern versions of Windows, even when it's a non-Russian Windows (for non-Russian Windows 3.1/3.11 it's not the case and a user must download those free non-Microsoft fonts ( see links below).
Users of Russian versions of MS Windows already have such CP-1251 fonts activated (as well as users of PanEuropean Windows 95), that is, they have, say, "Arial (Cyrillic)", etc.
Users of the U.S. version of Windows NT 4.0/2000 also already have such CP-1251 fonts.
Just open Wordpad editor (Start/Programs/Accessories/Wordpad) and see Cyrillic variations of several NT 4.0/2000 fonts.
Users of the U.S. version of Windows 95/98/ME initially don't have these Cyrillic variations of standard Microsoft fonts.
To activate Cyrillic in such standard MS fonts, these users must install a free Microsoft software - "MS Multilanguage Support".
(In addition to the fonts, this installs Cyrillic keyboard files, too).
Windows russification, complete instructions (a little bit complex)
Windows russification Fonts, Software, Russian Keyboards, etc...
Cyrillic Support 2000 (soft+fonts) - $89, Описание