This is hows you would setup to see the text properly.
After setting it might maybe ask for your Windows Xp istallation CD and reboot required!
1) Open My Computer -> Controlpanel
2) Dobbelt-click on Regional Language Options (icon)
3) Choose Language - tab
Now you can see the following window:

4) Tick the following options:
Install files for complex script and right-to-left-languages (including Thai)
Install files for East Asian Languages

5) Now click on details button in the same tab as before:

And now the Text Services and Input languages window will open
6) Choose Advanced - tab
Now you see the following window:

Now you have tick the following option:
Extend support of advanced text services to all programs (Compatibility Configuration)
Window will look like this:

Click on - OK
Now you will switch back to the former window.
Click on - OK
and reboot…