Sam-antha,
Thank you for visiting the Microsoft Genuine Advantage Forum. The purpose of this forum is the support of Windows Genuine Advantage (WGA) program. Your question is off topic as well as outside my area of knowledge.
Here is the website for the Japanese Language Pack: http://www.microsoft.com/downloads/details.aspx?FamilyID=24a66277-cd9f-4332-a6f1-52b85a6470bd&DisplayLang=en.
To replace the recovery disks from Dell please call the computer manufacturer, 800- 624-9896 or
if you have lost, broken, or misplaced your original Microsoft Office or Microsoft Publisher installation CD, you can order replacement media from Microsoft @ http://support.microsoft.com/kb/302822/en-us.
Windows XP is also up to Service Pack 3 now, so make sure that you have SP3 for Windows XP.
Thank you for visiting the forum.
Lori MS