installer woes, 9.1 on windows 2008 R2

trying to install 9.1.9 64bit on a win2008 r2 server and getting a
failure of the initdb phase, with no clue why.

I've installed the application on C:\postgresql\9.1\ and the data on
D:\postgresql\9.1\data ... after the first try, I added the
LOCAL\postgres user to the permissions on the D:\postgresql\9.1
directory and gave it full control, this propagated to the .\data dir
too, then I tried running the installer again (since there's no clues
how to manually invoke the initdb process properly). same error, no clues.

'problem running post-install step. ....
The database cluster initialization failed'.

is there an installation log somewhere? I haven't found it in either
\postgresql\ path.

if it matters, this server is a member of the corporate active
directory, as is my user account that I ran the installer from (but said
user account is a member o the local Administrators, and the PG
installer invoked the privilege elevation thing when it started)

--
john r pierce 37N 122W
somewhere on the middle of the left coast