1. Go to where the game directory is located (C:\Program Files\Ubi Soft\)
2. Right-click on the Studio Mythos folder and select Properties.
3. Click on the Security tab and highlight the Users account listing.
4. In the permissions box below, check the 'Allow Full Access' box.
5. Click Apply and OK to save the changes.
Next time you start Petz, you should not have any more trouble.