Official document says

來源: CutOnce 於 2006-10-13 09:07:06 [] [舊帖] [給我悄悄話] 閱讀數 : (256 bytes)

http://support.microsoft.com/kb/837783

Around 1500MB.

If you install Eastern Asia fonts and a little extra, 2GB or more is expected due to tons of security patches and its uninstall contents. That's the space required for average users.

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