If you can change the language of your Windows XP installation from a foreign language to English, then the opposite must also be true. Such as when turning it from English to Simplified Chinese. Again, you will need to download Windows XP Service Pack 3 but be sure to find the one in the language desired by your client.
The following links downloads directly from Microsofts servers and the available language versions of Service Pack 3 including English:
Windows XP Service Pack 3 English
Windows XP Service Pack 3 Simplified Chinese
Windows XP Service Pack 3 German
Windows XP SP3 French
Windows XP SP3 Russian
Windows XP SP3 Japanese
Before installing the Service Pack, edit the registry first. Go to the same location as discussed before:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\NIs\Language and change the "InstallLanguage"
registry value to the desired language. See table below:
Like the conversion to English, it's not 100% perfect but it's a step in thedirection to make Windows XP usable for your non-English using client.
