Step 1: Click Here to visit Google Input Tools (Download)
Step 2: Select "On windows" tab if your are using windows 7 operating system.
Step 3: In Right pane select your language ( Tamil)
Accept terms and services
Step 4: Click on "Download" Button, Now "InputToolsSetup.exe" will be downloaded
Step 5: Install by double clicking the "InputToolsSetup.exe"
Step 6: Once the installation completes
Go to control Panel --> Clock, Language, and Region
Step 7: Now, select "Change keyboards or other input methods"
Select "Change Keyboard"
Check "Tamil" keyboard is selected
Step 8: Click on "OK" and exit
Step 9: In Task bar change keyboard from "EN" to "TA"
Step 10: Now its ready to type in Tamil, type Tamil in anywhere in your PC
