You may download the following free Cyrillic fonts to view Windows-1251 encoding. The font are self-extracting archives. Once the fonts are downloaded and de-compressed, you need to install them on your system. You may need to quit all active programs or restart your computer in order for the system to recognize the presence of the new fonts. Once the fonts are installed on your system, you will need to configure your web browser to use them when the browser encounters a page in Cyrillic.
Configuration varies from browser to browser.
Your system should then be able to properly read pages in Windows-1251 Cyrillic encoding.