Generally, the only way to get hold of a calendar in Windows is to double-click on the time in the Notification Area, which will bring up the Date/Time Control Panel.

This includes a calendar, but it does make it easy to accidentally change the date to which the computer is set.

This tiny application does nothing else but display a calendar.

No installation is required - simply unzip the download and run the program from there. That's all there is to it, really - but this is an extremely handy utility that won't take up much room on a PC's hard disk.