ok, let me try one more thing before you get too far, try THIS installer file and see if it helps.
https://www.dropbox.com/s/39lu...lhfv/mydmx3.exe?dl=0
So stop that one, delete the exe you downloaded from the website, try mine and let me know if its any faster, if not, i will need to move you to email support with me and i can talk to the developers.