To sync events to Microsoft Outlook calendar events, please download Google Calendar Sync.
Compatibility: Currently, Google Calendar Sync is only compatible with Microsoft Outlook versions 2003, 2007, 2010 and operating systems Windows XP, Windows Vista, and Windows 7. Windows XP 64-bit Edition is not compatible with Google Calendar Sync at this time.
Once a dialog box appears, click Save File. The downloaded file should open automatically. If it doesn't, manually open it from your browser's download window.
Click OK to confirm that you're aware this is an executable file.
Read through the Google Calendar Sync Terms of Service, and click I Agree.
Follow through the Installation Options and click Install to finish the set-up process.
Google Calendar has more details.