am2003,
I have had the same problem.
I changed the entry in the config.php for $xcart_http_host ="localhost" &
$xcart_https_host ="localhost" to 127.0.0.1. This seems to fix the problem and while I don't know the wider implications of the change, if any, it works well enough for an Offline WAMP server.
#
http://www.yourhost.com/
#
https://www.yourhost.com/
#
$xcart_http_host ="127.0.0.1";
$xcart_https_host ="127.0.0.1";
Regards, Jr.