I am new at building a web site, this may be a stupid ? Why do I get the following message on all my pages?

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I am new at building a web site, this may be a stupid ? Why do I get the following message on all my pages?
What file are you trying to view? But first you should try going through Yahoo SiteBuilder and clicking publish. I%26#039;ve never used the yahoo builder, but if you can get Microsoft Frontpage I%26#039;d suggest that for novices. It%26#039;s not the most powerful tool around, but I%26#039;ve never had any problems with content uploads and the like.
I am new at building a web site, this may be a stupid ? Why do I get the following message on all my pages?
You may be using files with names that don%26#039;t end in .html or .htm. If you are not familiar with HTML then create your files using a site builder utility program that automatically saves your files ready to upload or that directly interacts with your website. I don%26#039;t use it but I believe SiteBuilder does that.