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Run the Program Compatibility Wizard

Open the Program Compatibility Wizard by clicking the Start button , clicking Control Panel, clicking Programs, and then clicking Use an older program with this version of Windows.

Follow the instructions in the wizard.

If you cannot install a program, insert the installation disc for the program and, using the wizard, browse to the program's setup file, usually called Setup.exe, Install.exe, or something similar. The wizard is not designed to work on programs that have an .msi file name extension.

To change compatibility settings manually for a program, right-click the icon for the program, click Properties, and then click the Compatibility tab.

http://windows.microsoft.com/en-US/windows-vista/Make-older-programs-run-in-this-version-of-Windows
 
But, why don't u try the google one?
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Welcome to Google Calendar
7 reasons to use Google Calendar

Organizing your schedule shouldn’t be a burden. With Google Calendar, it’s easy to keep track of life’s important events all in one place.


1. Share your schedule

Let your co-workers, family, and friends see your calendar, and view schedules that others have shared with you. When you know when everyone is free or busy, scheduling is a snap.


2. Get your calendar on the go

With two-way syncing to your mobile phone’s built-in calendar or a mobile version of Google Calendar that’s made for the small screen, you can access your calendar while you’re away from your desk.


3. Never forget another event again

Customizable reminders help you stay on schedule. You can choose to be notified by email or get a text message sent right to your mobile phone.


4. Send invitations and track RSVPs

Invite other people to events on your calendar. Guests can RSVP to your events by email or via Google Calendar.


5. Sync with your desktop applications

Access your calendar however and whenever you want by syncing events with Microsoft Outlook, Apple iCal and Mozilla Sunbird.


6. Work offline

Know where you’re supposed to be even when you don’t have internet access. With offline access, you can view a read-only version of your calendar no matter where you are.


7. All this is free?

Yep.


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http://www.google.com/intl/en/googlecalendar/about.html