What is the state of your machine now? If there is a partial or unsuccessful installation of version 8 or 8.01 I recommend that you uninstall it and start over with the download from the web site. Accept the "typical" installation if you are satisfied with the default directory structure; if you wish to install in a different directory then you will have to do the "custom" install.
As I understand it, WG is working on smoothing the installer so that this problem don't arise again. As you say, it is annoying -- but fortunately it is also surmountable.
Hope this helps.
Edited by Robert Jacobs, 20 February 2012 - 01:54 PM.