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Have you tried disabling ZoneAlarm before installing Calibre?
Also, I suggest you check your hard disk for errors - it could be you have some bad segments and Windows is choking when it tries to access them. Right click the drive (in Explorer etc), select Properties, Tools, Error-checking (this is in XP). Warning - this will take some time, and Windows may need to reboot and perform the check as it starts up.
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