If you find any problem in viewing this unicode tamil font, Please make sure that you have installed East Asian Languages.
1. Goto Start >> Settings >> Control Panel
2. Open Regional and Language Options
3. Click Language tab
4. Select Install files for East Asian Languages
5. Click OK when winodw prompts for window message.
6. You may required to place your Operating System CD-ROM in the drive for accessing files for East Asian Languages support.
7. click Ok once everything completed.
Please write me if you need any help further.