The reason you cannot use Calibre past 2.0 with Windows XP is that a lot of XP installs are on hardware not capable of running Calibre 2.x and sometimes it's due to XP itself. So instead of having a support nightmare for those where Calibre 2.x won't run properly, it was decided not to allow Calibre 2.x to run under XP. If your hardware is capable of running Calibre 2.x, the way to be able to use Calibre past 2.0 is to upgrade to Windows 7 or later.
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