Please provide your installer log, it will have the same name as the installer but with .log on the end:
Installer: forge-{version}-installer.jar
Log: forge-{version}-installer.jar.log
Note: If you have Windows Explorer set to hide file extensions(as is the default setting), they will look like this:
Installer: forge-{version}-installer
Log: forge-{version}-installer.jar
Please make your own thread.