Language Pack issue in Ultimate

I upgraded a Win7 Professional 64 bit system to Ultimate, then downloaded Language Packs in Chinese and Japanese. Now I am able to switch between Display Languages as expected. But after my last return from Japanese as Display Language to English, I find that Windows Explorer shows date information in Japanese, and IE uses Japanese as its language. Yet the Desktop icons have English legends, and the Start menu is in English. So there is a mixture of languages. Is there a way to eliminate Japanese completely? Should I uninstall the Language Packs? Is this a bug or is this my error in configuration? Thanks.

I resolved this by uninstalling all Language Packs.

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