Why don't you go to control panel
and set up Thai language after you finish using it
just only click remove ; for more information PM me ^^
You can't except you have the window setup disc =P or you can? o__O not sure either 555
Just download it from Thailand bittorrent, it's too easy!
First, get a blank disc and burn image into your disc
second, if finished eject disc and insert it into a computer again
so go to control panel choose installe east asian ... (sorry i'm forgot remembered only it like this)
click and then apply.
Finished it, install thai keyboard (THAI Kedmanee), that's all.