I had the same problem, read all the threads here and figured I was on my own. I uninstlled D-view, went to program files (86), deleted the directory D-Link (check if first to make sure you don't have another Dlink software there. I went into regedit also, but I do not suggest this unless you are familiar with regedit.
I re-installed and it gave me the option to use a new pw. Hope this works for you.