1.At first you will be download and install Bengali Indic IME and this software will be collect from BhashaIndia.com
2.Then you keep Windows XP(SP2) CD
3.Then start control panel (start >control panel)
4.Then select "Regional and Language Options"
5. Regional and Language Options" > Language Then select"Install files for complex script and right-to-left languages (including Thai) then may be Windows CD
6. For Bangla type writer, Control Panel >"Regional and Language Options" > Language >"Details" > "Text Services and Input Languages" >"Installed services" > "Add" >"Add Input Language" > "Input language" >"Bengali(India)" >"Keyboard layout/IME"check box select then select from dropdown menu > "Bengali Indic IME 1 [V 5.0]"| then twice "Ok" button click and close dialog box.
And you are ready for Bangla write.
Before Bangla writing you will be write Bengali Indic IME documentation for joint writing.