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Your system doesn't support Devanagari fonts. If you're using Windows, install the fonts from Microsoft Support. 

Update:


Download this(press the big blue Download Now button)
Open the downloaded file and click onInstall button(requires administration privileges) 
Open the log, and select encoding as UTF-8


Update#2:
For details on how to set the encoding to UTF-8:
 - click on the 
    File menu - click on save as - on the drop down menu beside the field encoding, select 

CHARSET UTF-8