Update query

I know this is really stupid but i'm having trouble with update info to my database.

this is the piece of code i'm using

<%
username = Session("username")

dim firstname

firstname = Request.Form("firstname")

Set DatConn= Server.CreateObject("ADODB.Connection")
DataConn.Open "DSN=database"

SQLask = "UPDATE [details] SET [details].[firstname]=' " & firstname & " ' WHERE [details].[username] like '%" & username & "%';"

DataConn.Execute SQLask
DataConn.Close
Set DataConn= Nothing

%>

The error i'm getting is "Operation must use an updateable query."

Can someone tell me where I'm going wrong.
thanks
sf

This error usually means that you're using an Access Database that doesn't not have the correct write permissions setup. The IUSR_machinename user must have write permission, as must any users using an NT account on the machine.