If you’re having troubles running Spooky Dwellers on a Windows 7 PC, please verify that your Windows 7 is updated. Specifically, note that the minimum requirement for Spooky Dwellers is Windows 7 with Service Pack 1. Your graphic drivers should be updated too.
Here are some links to update your Windows 7:
It’s also important that your graphic card drivers are updated. These updates should let the Spooky Dwellers games run properly on your Windows 7 PC.
Finally, remember there is a complete guide for Spooky Dwellers here.