XtCommerce 3 installation

[Baudy]

Hy,

nachdem ich die installation von XTC 4 aufgegeben habe stehe ich nun bei XTC 3 vor diesem Problem

Warning: require(C:/inetpub/vhosts/partytischdecke.baudy-technology.com/httpdocs/Index.phpincludes/classes/boxes.php) [function.require]: failed to open stream: No such file or directory in C:\inetpub\vhosts\partytischdecke.baudy-technology.com\httpdocs\xtc_installer\includes\application.php on line 38

Warning: require(C:/inetpub/vhosts/partytischdecke.baudy-technology.com/httpdocs/Index.phpincludes/classes/boxes.php) [function.require]: failed to open stream: No such file or directory in C:\inetpub\vhosts\partytischdecke.baudy-technology.com\httpdocs\xtc_installer\includes\application.php on line 38

Fatal error: require() [function.require]: Failed opening required 'C:/inetpub/vhosts/partytischdecke.baudy-technology.com/httpdocs/Index.phpincludes/classes/boxes.php' (include_path='.;./includes;./pear') in C:\inetpub\vhosts\partytischdecke.baudy-technology.com\httpdocs\xtc_installer\includes\application.php on line 38

Kann mir da bitte wer helfen?? bin am verzweifeln