Then download a neat and clean Bangla Unicode font. I recommend AdorshoLipi. To install it in Windows, simply copy it to your Fonts folder. The Fonts folder is located in the Control Panel.
Now, you gotta configure your browser:
Internet Explorer
1) Go to the Menu Bar.
2) Select Tools\Internet Options.
3) Click on the Fonts button, from there:
3.1) Select Bengali for the Language Script.
3.2) Select AdorshoLipi for the Webpage and Plain text fonts fields.
Firefox
1) Go to the Menu Bar.
2) Select Tools\Options.
3) Go to the Content tab.
4) Click on the Advanced button; from the Fonts & Colors section of the popped up window:
4.1) Select Bengali for the Fonts field.
4.2) Select AdorshoLipi for the Serif and Sans-serif fields.
Done!
Please refer to this Wikipedia page, if this tutorial doesn't apply to you.
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