As mentioned on the calibre download page:
http://calibre-ebook.com/download_windows
Quote:
Note
calibre 2.x uses Qt 5 which is known to be incompatible with Windows XP machines. If you are using Windows XP please, use calibre 1.48, which works with all Windows XP machines, from here. Simply un-install calibre 2.x and install 1.48, doing so will not affect your books/settings.
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Edit: PeterT, thanks for the quote.
But in that case the OP was asking for calibre2.x specifically, Galactica sounds like s/he is okay with any version of calibre -- in which case running from modified source may not be necessary -- the latest version that works on XP should suit his/her needs.