I'm sorry about the issue. Is this a new computer?
Do you know if your computer has Windows XP, or Windows Vista, or Windows 7 or Windows 8 or 10, etc.?
Do you know what kind of calendar is it, such as Outlook, Google, etc.?
What email do you use, such as Hotmail, Yahoo, Gmail, AOL, etc.?
Please reply at the box below. Thank you,