As per Dave Hooton's request in this forum: http://community.logos.com/forums/t/36252.aspx
I too can't get Logos 4, either stable or Release candidate to install and/or index on my new laptop: Toshiba AMD Vision Quad Core running Windows 7 Home Premium.
I now have Logos running in some form due to the work around methids in the Logos Wiki. I used Method 1.
I cannot however run Logos 4 without granted higher level privileges to the program via UAC and do not and have not ever had to do this on any other computer.
If I run Logos 4 without these privileges it crashes because it needs more access....