Invalid username specified

I'm using WIn2k/sp3 on machine at work connected to windows domain.

At the "Service Configuration" screen it tries to make a userid "postgres".
I get...

"Want the account created for you?" YES
"Random password is..." OK
"Succesffuly grantred right" OK

THEN

MOST of the time I get "Account Error" "Invalid username specified: Logon
failure: unknown user name or bad password."

SOMETIMES it correctly and proceeds to "initialize database cluster"

When I get Invalid username I tried deleting the "postgres" user, rebooting,
waiting for the twenty minute timeout windows authentication always seems to
take. But nothing definatively works. I'll try a bunch of times and it will
work sooner or later.

I have found that by disconnecting the laptop from the network - it will
install every time.

This has happened through the RC series as far as I can remember. I've found
no other references in the mailing lists.

What is going on? Am I the only one?

TIA...

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