I get this error when I try to preview a PHP script:
Fatal error: Call to undefined function language_attributes() in C:\xampp\htdocs\wp\....
This is the line of code causing the error: <html <?php language_attributes(); ?>>
Wordpress defaults to English, and the application is running in my local development environment just fine so I'm certain this is not a wordpress issue.
I also know this isn't a a wordpress support forum nor an xampp forum, so I'm not asking for help with those tools but, as a wordpress website developer, I need to be able to see how things look as I'm working with the code.
It has been a couple weeks of (expletive-deletive) labor trying to get my development environment reinstated but I'm fairly certain this was working on my Vista computer, prior to the motherboard failure that caused me to have to a new computer.

I am using WeBuilder 2010 10.0.2.118
I've verified that the tool is looking for PHP in the Xampp folder on my hard drive. Is there some other trick?