tapinstall.exe is just a renamed DevCon.exe (
http://support.microsoft.com/kb/311272/en-us). If tapinstall.exe installs a TAP device driver, this change is obviously permanent. So tapinstall.exe adds a new network adapter and a new network connection (a network interface) to the system. Is it a big deal? 🙂 Oh, and openvpnserv.exe installs a new service (OpenVPNService).
