Error occurred while doing research on Internet Explorer with Windows XP Professional

When I was doing some research on the internet all of a sudden the following message appeared. I am using Internet Explorer on my Windows XP Professional. Can anyone tell me what the problem might be?
Windows Internet Explorer
Function areaFunction{radiusParam}
{
/// <summary>Determines the are of a circle
/// based on a radius parameter.</summary>
/// <param name= "radius" type= "Number"> The radius
/// of the circle.</param>
/// <returns type="Number"> the area.</returns>
Var areaVal;
AreaVal = Math.PI * radiusParam * radiusParam;
Return areaVal;
}
OK
