Windows Vista has a lot of extra security features, including User Account Control that could be interfering with the game's ability to save its progress. You should check to make sure that you installed the game from an administrator account and that you either run it from an administrator account or right-click on the game icon and select "Run as administrator" from the popup menu.
All of our games have been tested with Windows Vista and operate correctly, however some game sites package our games in various download managers and registration software that is not Vista compatible. If you purchased the game from a site other than LDW, you should check with that site to make sure that their versions are Vista-compatible.
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Barbara
Unicorn
Last Day of Work