When trying to install VirtualBox on Windows, I got the following error. The version is VirtualBox-4.3.20-96997-Win. I have reviewed this question and it's not the same issue.
More info just says that the installer is not recognized. It also gives the "run anyway" option.It says "common.cab" is corrupted. I've downloaded 4.3.18 (The check sum is identical), and the installer finished but some how breaks the WiFi driver (connected but no network). The program also doesn't run for no apparent reason and I've tried several compatibility options.