Downloading and installing MDAC 2.6 will resolve this.  It's available at 
Microsoft's web site.

> I've got exactly the same problem. Please guru, an answer...
> 
> > Does anyone know why the code below does not work ?
> > 
> > <%
> > Dim a
> > Set a = Server.CreateObject("ADODB.Record")
> > a.open "readme.txt","URL=http://localhost/c1"
> > set a = nothing
> > %>
> > 
> > When I run this script, the following error occurs:
> > 
> > Error Type:
> > Microsoft OLE DB Provider for Internet Publishing (0x80004005)
> > Unspecified error 
> > /c1/upload.asp, line 17
> > 
> > nb: I'm using IIS5 on Windows 2000 server
> >