Same problem as with The Longest Journey.

Windows 7

The launcher Icon has this administrator icon on it, so if you click on it it will prompt for admin password.

If I uncheck the "Run as administrator" checkbox in the advanced settings of the compatibility tab I can start the game as normal user, but it doesn't start and I get the message, that some files are missing, I should reinstall.

It seems, that the game can't read / write / execute files with a non-privileged user...

How to fix this?

If you're dead set against running it as Admin, you could always play it using ScummVM, which doesn't require Admin rights.