Failed opening required 'System.php' (include_path='.;C:\php\pear') in D:\wamp\www\z
In WAMPServer, the include_path is commented out, so you are getting the default version which is why it is pointing to include_path='.;C:\php\pear'
So you could try editing the php.ini file, using the wampserver menus to make sure you edit the correct file (\wamp\bin\php\{phpVersion}\bin\phpForApache.ini)
wampmanager->PHP->php.iniAnd add a proper include path in place of the commented out one in there already
include_path=".;d:\wamp\bin\php\{yourPHPVersion}\pear"Although I have an idea this is not related to PEAR at all.
You would probably be better of creating a Virtual Host for the Wordpress site to run in, then it will probably find the file its looking for in the theme folder.