You can write Bengali in your PC.
To do so you have follow some steps.
1. Go to Start>Settings>Control Panel>Regional and Language Options
2. Click on the Languages tab on the top.
3. Under “Supplemental language support”, put a check mark against “Install files for complex script and right to left languages (including Thai)”and click OK. Windows might ask you to insert the installation CD to complete the process
4. Restart your computer. Do not forget to do this.
Next, set up your Indian language keyboard.
5. Go to Start>Settings>Control Panel>Regional and Language Options
6. Click on the Languages tab on the top once more
7. Click on Details under “Text services and input languages”
8. Under Installed Services menu, click on Add.
9. Next, under Input Language, select Bengali (India)
10. Under Keyboard Layout/IME, select Bengali (Inscript)
11.In the Installed Services menu that you got to in Step 4 above, you will find Preferences. Click on Language bar. Here, put a check mark against “Show the Language bar on the desktop”. Also, put a check mark against “Show additional Language bar icons in the taskbar”. Click OK till you exit the dialogue boxes.
You are now set to type in Bengali in Notepad, Wordpad, Word and even in Outlook and Excel.
13.To switch between English and your Indian language, press Left Alt+Shift. You will see ‘EN’ or ‘BN’ (for Bengali) on the lower right corner of your taskbar. This indicates which keyboard is active.
14. On Screen Keyboard. Open it by going to Start—Programs—Accessories—System Tools and click on On Screen Keyboard. Open Notepad. Change to Bengali pressing Left, Alt and Shift. You will see EN change to BN on the taskbar at the bottom of your screen. Type something and then click on the On Screen Keyboard. All the character placements will show up. Pressing Shift will show you the other characters. More characters can be got by pressing Control and Alt together.