ahhh, yes the dreaded "Portal Failed to install".
just finished with that one on Sunday, was failing every single time at the portal installation.
i don't know what fixed my issue, but as soon as i changed the following items, it installed. (well... it "seemed" to install after i changed the items below, but it could of been one of the other 300 things i was messing with)
in web.config I had Changed The Following TO:
minRequiredPasswordLength="8"
minRequiredNonalphanumericCharacters="2"
I Changed them back TO:
minRequiredPasswordLength="8"
minRequiredNonalphanumericCharacters="0"
Also, remove the DB in the App_Data before you attempt to install again.
Notes:
- my password is longer that 8 characters, if yours is less, the change the 8 to your required pwd size.
HTH
Johnny