Im having some trouble with this;
I have the "run as admin" option greyed out, so i right click + select "Run as Admin" instead.
Still no joy, on Vista 64bit Ultimate
i think your problem is 64 bit related, i had to do the same steps and turn off uac. But i'm on 32 bit and it worked with no issues at all. sorry about your problem, if you find a way around it let us know so everyone can use your experience!
hope you get it working