If you can't see bangla properly then the reason is that you don't have the Vrinda font installed in your PC. To resolve the problem, follow these instruction:
1. Download the Vrinda.ttf(287kb) or Vrinda.zip(166kb).
2. Copy vrinda.ttf from your downloaded location and click Start-> Settings-> Control Panel-> Fonts, and press Ctrl + V to Paste it into the Fonts Folder.
3. Refresh your bowser (press F5 or click on Refresh button)