We deeply apologize for all inconveniences you have experienced. Please, be informed that the window of Virtual Serial Port Driver can't be resized. If the buttons don't fit the application window, I can make an assumption your screen resolution differs from the standard one which our software was designed for. Please follow the instructions below:
1) Display Properties -> Appearance -> Font Size -> Normal -> Apply.
2) Display Properties -> Settings -> Advanced -> DPI setting -> Normal Size (96 DPI) -> Apply.