While working on enhancements to the calculator tool, I encountered a BSOD every time I change the layout (e.g. Scientific->Standard) and close out of the program based on the changes that I was trying to make to the program. And just for future reference, I was trying to get the program to use the registry instead of storing settings onto win.ini, as the file is used as backwards compatibility for 16-bit applications. I know that my work on the calculator program is a work in progress, and is in no sense a reflection of the final result, but I am only posting it because it caused a crash on ReactOS and it might help other developers out there who might have a better idea of what might be causing it. I've tested the program on Windows 7 and it didn't crash the system, so the problem doesn't seem to be coming from the program itself.