Yes, that same problem happened to me - I had reinstall
my whole system, after spending an hour on the phone with
microsoft and another 2 horus with Dell - no one could
figure out how to get past this point - it just froze up
at the welcome page !!!!
My problem started after I installed the software just
fine, started to do a scan and half way through the scan,
it just stop working - my whole computer froze and I
could not get anything to fucntion withour turning the pc
off, when I turned it back on it froze up at the welcome
screen upon boot-up and never went any further !!