Access 2007 connection string

I am connecting to my database with this string:
strconnWOI = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & Server.MapPath("/_database/nameofmydatabase.accdb")
which, then I response.write out shows the correct database location.

However, when I use these commands to open:
set rs = Server.CreateObject("ADODB.recordset")
set rs = strconnWOI.execute("Select * FROM Participants WHERE Login = '" & Login & "'")

I get an error:
Microsoft VBScript runtime error '800a01a8'
Object required: 'Provider=Microsoft.A'

I have converted this database from an Access 2003 database that was working with the old Access2003 connection string.

What am I doing wrong?

Judy