Hi Hazi,
a font doesn't work on Photoshop, a font works on Windows.
So you need to install the font on Windows, not on Photoshop.
everything's written here :
http://www.dafont.com/faq.php#win
you can eve find videos on "how to install fonts on windows" here :
http://www.youtube.com/results?search_query=dafont
good luck
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