There are several different scenarios that could cause the savegame file(s) not to be found and loaded. One possibility is that you're logged onto the computer as a different user than you were last night, since the savegame files are stored in the My Documents folder for the currently logged on user. To find out for sure what happened, you need to make sure if the files are really "gone" or not. The first thing to do is to search your computer for the file Isola21.ldw (the method you need to use will depend on whether you're running the Windows version or the Mac version.
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Barbara
Unicorn
Last Day of Work