Guys thanks for the reply, but the nlite does not really mess with the S-1-5-19 account at all. I have seen all .inf/.in_ files and there is no reference to the S-1-5-19 account. After I found this information from ms: http://support.microsoft.com/kb/307419 , I am guessing that is created from within an .exe or .dll file by default during the installation. This is really weird problem, but maybe someone have came across this, or knows the low-level setup process.