i have the similar problem and i am trying to solve it since 5 days. I followed all the steps that has been shown here but i still have this problem.
the problem is when i click + button to add MySQL Connection in Dreamweaver CS4, I get the form to fill and i fill it exactly as it was described in the guide that u linked but still i get "An unidentified error has occured" message.
i googled the error msg and trying to fix it since 5 days. pls help and save my nerves.
more exact info here:
I am trying to connect to mysql database throught dreamweaver cs4 in an PHP environment. I use IIS7 (i know, it is not recomended.)
I reconfigured IIS and my server root folder is "C:\grytrn\"
I installed PHP on IIS while UAC was off
I installed mysql and phpadmin as it was described in adobe website.
I dunnow what is wrong here.. do you have any ideas?