prova a sostituire il file "iscriviti.asp" con questo qui:
<html>
<head>
<title>Index</title>
</head>
<!--#include file="db.asp"-->
<body>
<%
SQL="INSERT INTO cliente (nome, cognome, via, ncivico, citta, telefono, codfiscale, email, sesso, password, username, tipo) VALUES ('"& request.form("nome") &"', '"& request.form("cognome") &"', '"& request.form("via") &"', '"& request.form("nc") &"', '"& request.form("citta") &"','"& request.form("telefono") &"', '"& request.form("codfisc") &"', '"& request.form("mail") &"', '"& request.form("sex") &"', '"& request.form("pw") &"', '"& request.form("user") & "', 'utente')"
response.write(sql)
set Rs = db.execute(sql)
response.redirect "index.htm"
%>
</body>
</html>