To enable Bharatiya script support in Windows XP,
Go to Control panel
Click on 'Regional and language options'
Go to 'Languages' Tab
Check select 'Install Files for complex script and right-to-left languages [including Thai]'
Press OK
For Microsoft Office 2003,
Go to Start->All Programs->Microsoft Office->Microsoft Office Tools->Microsoft Office 2003 Language Settings
In 'Enabled Languages' Tab, choose 'Indic' from 'Available languages' combo.
Select all scripts you need from the list below and Press 'Add >>' button.
Press OK
In Microsoft Word
Go to 'Tools'->'Options'->'Edit'. Uncheck 'Smart cut and paste'.
Press OK