Using Netscape or IE: Download the KOI8-R font from this site and install it according to directions as a font on your computer. Then set the preferences in Netscape to accept KOI8-R as the default font for Russian. Then go to the view window and under character set, choose Cyrillic (KOI8) as the character set. This should work.
Check out the following sites for information on viewing Russian text on your computer: Here for a comprehensive review of the issues involved.
This site for the latest information on KOI8-R standards,
and this site for some useful software for writing in Russian on a computer.