Please help with Multilingual data on Vista

I have a Windows Vista Japanese machine with MS Office 2007 installed. I have a Windows application that displays multilingual data. When I copy Japanese charatcers from the application and paste into MS Word/ Excel garbage characters appear. This problem doesn't occur when pasting from Word into the application.

Also this problem does not replicate on any other OS or in any other language either.

Thanks in advance for your help!

-gKul