I can't delete calendars from iCal, they re-appear in a few moments. Also I can't add new entries. I have a backup on another  Mac which is working properly.

For the last 2 weeks iCal has not let me update or delete calendars. It continues to remind me about events in the past (about 10 days ago).
Also, Safari is not recording history, apart from today the last entry is 2 weeks ago.
Time and date is working OK.
All software is up-to-date.

My problem is fixed now, thank you. It was caused by my changing the Boot Camp partition's 'RAID1' to 'RAID0'. If I hadn't done that, Boot Camp would still have been able to 'restore' back to the one partition. It was fixed with the help of Applecare by using a terminal and typing a command to erase the IP of the Macintosh disk (not the volume) as well as the IP of the Bootcamp partition (if I remember correctly), but then I had to restore the OS and all my applications and data etc which I had previously backed up using Time Machine. I haven't taken note of the exact command terminology used. It would be wise to speak to Applecare about this if possible.
Two words of warning, 1. According to the cause of this problem, it might be wise, after reinstalling the ops system to reinstall all extra applications one by one, manually, in case a similar problem arises again. Then manually copy back all data. Or the Mac user could use the Time Machine backup and then uninstall all the added apps then re-install them one by one manually. 2. Beware as after all this the user might not have the 'Recovery partition'. There is a small recovery partition (a few 100 Mb is size) which comes with all later Macs. After all this is done this tiny partition might not be there anymore and the user might have to re-install Mavericks again to get it back, or just install the upcoming update of Mavericks due in a month or so.

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