Where can I find my Movies directory?

The Moviestorm home folder is generally created within the users home directory.
On Macs, Vista, Windows7 this would generally be Users/[Current user]/Moviestorm
On XP it defaults to C:/Documents and Settings/[Current user]/Moviestorm

This might be instead be on a network drive, depending on how the network is set up.

In this folder, the users movies are saved (in a Movies subfolder), their configuration is created ('Machinimascope.properties'), and logs for troubleshooting are created ('boot.log' and 'log.txt').