change the first 2 lines:
<?php virtual("/WA_ValidationToolkit/WAVT_Scripts_PHP.php"); ?>
<?php virtual("/WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php"); ?>
to:
<?php require_once("WA_ValidationToolkit/WAVT_Scripts_PHP.php"); ?>
<?php require_once("WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php"); ?>
in your Dreamweaver site settings, on the local info tab there is a setting for "Create Links Relative To".
If this option is set to "Site" Dreamweaver will use the virtual function for included files. The virtual function is not supported on all platforms. Set this option to "Document" instead. this will cause Dreamweaver to use the require_once function which is supported on all platforms.