My installer package installed with virtualbox. My computer already had virtualbox, but I uninstalled Genymotion. So of course I followed the Genymotion wizard and proceeded to install a new virtualbox
After installing it all, I opened Genymotion and tried several times with this result.
I tried to download the latest version of Virtualbox, but it didn't work. On the contrary, my classmate's win7 can be successfully opened