Prova così:
codice:
<body link="#000000" vlink="#000000" alink="#000000">
<%
set conn = server.createObject("ADODB.Connection")
conn.open "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & server.mapPath("miodb.mdb")
sql = "SELECT * FROM nazione ORDER BY descrizione"
set rs = conn.execute(sql)
if not rs.eof then
%>
<form action="result.asp" method="post">
<table border=1 style="font-family: Verdana; font-size: 10 pt; font-weight: bold">
<tr>
<td>Nazione</td>
<td>
<select name="oggetto">
<option value="0">SELEZIONA</option>
<%
do until rs.eof
%>
<option value="<%=rs("IDNazione")%>"><%=rs("Nazione")%></option>
<%
rs.moveNext
loop
%>
</select>
<%
end if
rs.close
set rs = nothing
conn.close
set conn = nothing
%>
</td>
</tr>
<tr>
<td>Nome Azienda</td>
<td><input type="text" name="NomeAzienda" size="20"></td>
</tr>
e fai sapere