DSN Error - Please Help

I was going through a turorial (see link below) and all was
going well until I got to the part where I was to connect the web site to
the Database. In DW I go to Application>Databases>+. (After getting a tick
next to each document type) After hitting the plus (+) sign I select the
DSN, give it a name and press "TEST" and I get, "An unidentified error has
occured".

I went back and double checked everything. All was fine. I rebooted and all
was fine.

I did just upgrade from Home edition to Professional and all went fine. no
problems, smooth as china silk.

Any ideas.

The tutorial is here:

http://www.webthang.co.uk/tuts/tuts_dmx/dmxf_1/dmx1_1.asp