Unicode Problem, Writing and Displaying Posts in Hindi

I am just in the test phase to launch our News Portal in Hindi Language.

For writing the posts in hindi, I’ve installed Indic IME plugin which translates my english word to hindi format (like google transliterate does). Plus, I also use Google transliterate to write posts and then paste it in post box and publish it.

The problem is – To 75% of the users the Hindi that is being displayed on site is same as I want, but on rest it changes to either other words or square boxes.

I also commented
//define(‘DB_CHARSET’, ‘utf8′);
//define(‘DB_COLLATE’, ”);
in wp-config as suggested on some site. But no avail.

The official launch is being postponed of this reason only. Please revert back if you have any solution.

Any clue, thanks a ton.