I have installed all the fonts that I could find and tried to change options from preferences and all (character encoding : auto, user-defined, unicode, etc.) , but nothing seems to work. I used to have no trouble with windows. Concerned websites : www.dinamalar.com , www.vikatan.com , www.kumudam.com , www.thatstamil.oneindia.com , well, basically every Tamil site that I use. Strangely some telugu sites have no trouble at all with these font issues.