Atchoo is a small application that connects with your Google Calendar, and provides you desktop alerts when some event is approaching.
On initial startup, input your Google Calendar Username and Password.
After that select the calendar for which you want alerts and then end the configuration setup.
Now, it will sit in the system tray and when the time of an event is reached, a desktop notification will pop-up, allowing you to either snooze or dismiss the alert. Snoozing time can be entered in text (ex. 1 hour 5 minutes) or select from drop box.
Atchoo runs on all versions of Windows.