Getting about blank error on win 7 while using webbrowser.navigate("about:blank")

I think as the error says you need to run your application as an administrator.

Your application need UAC elevation. First test the application by running in administrator mode and see if it works fine. If your app runs smoothly in administrator mode then I'll tell how you can make your application demand UAC elevation.

First run the app in administrator mode. To run the app in administrator mode, right click on your application and select "Run as Administrator" and click Yes when a msg box pops.

Let me the know outcome.