I sae at a computer shop.why dont you try calling them and ask :)
Harish V Hariharan
Business Development Manager
Microsoft Sri Lanka Pvt Ltd
Phone: +94-11-4765500
We have made available updated Language Packs for users using Windows Vista SP1 as well as those running Windows Vista RTM. For those running SP1, the Language Packs should be showing up for you under Windows Update...