I purchased the download version of MM17 on 9/11/2010.
As with hockeymaniav911's post, I have exactly the same problem. Eveything else installs ok. I sumitted a ticket to customer support the same day. I received a reply on 12/11/2010 saying it looks like a rights and/or privileges problem.
I replied that same day saying I run as administrator (Win XP Home sp3). I received a reply asking me to run syscheck, which I did and sent same day.
Here we are on 18/11/2010 with no answer and a software package which only half works.
Brian