Hi, I have had the same problem with VideoStudio X7, and managed to get it to install
I received lots of instructions from support as well, including disconnecting and disabling everything possible, but nothing would do. Same "Wizard not completed" error.
I saw in another thread that using a different user could do the trick.
So I created a new user on my computer, with admin rights, but not "THE" hidden administrator of Win 7.
I obviously made sure the install file would be accessible to the new user (e.g. not in a restricted "my documents" folder)
I launched the exe file and all went well
I have now deleted this new user which I didn't need for any other purposes, and all is fine.