1. Go to Control Panel and run Java 32bit application.
In the Java tab, click on View button. In the Runtime Parameters, type in -Xmx512m.
2. In the Internet Explorer, click Tools –> Compatiblility View settings.
Add 127.0.0.1 in the Compatibility View settings menu.
3. When you run the Cisco Configuration Professional, make sure to right click on the icon and choose Run as administrator option.