Japanese Keyboard Undetected

After installing a Japanese edition of Windows XP onto an HP desktop with a Japanese keyboard I was surprised to discover that it thought it was connected to a keyboard with a US "international" layout. When I installed the OS it had been attached to a US keyboard, but Windows hadn't updated when I swapped the proper keyboard in.

In the "Regional and Language Options" control panel "Text Services and Input Languages" was set to "Japanese." I couldn't find anywhere else to change the setting until I found this helpful entry. Windows needs to be forced to use the Japanese driver.