SQL Server 2005 Express Advanced Edition reports AGTACCOUNT error during Setup

SQL Server 2005 Express Advanced Edition reports following error during setup:

"SQL Server Setup has determined that the following account properties are not specified: 'AGTACCOUNT' . The properties specify the startup account for the services that are installed. To proceed, refer to the template.ini and set the properties to valid account names. If you are specifying a windows user account, you must also specify the password for the account."

After trying some of the stuff mentions at http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=365116&SiteID=1 I finally gave up.

But wait a minute, there was something about a template.ini file.
This is what I did and it worked. First copy the install files from your Read-Only media (CD/DVD) to a folder on your hard-drive. Open the template.ini file (directly under the root folder containing the setup files).

Look for the following section:

; Note that if SQLBrowser is already installed, SQLBROWSERACCOUNT and SQLBROWSERPASSWORD are ignored.

SQLBROWSERACCOUNT=
SQLBROWSERPASSWORD=

SQLACCOUNT=
SQLPASSWORD=

AGTACCOUNT="NT AUTHORITY\NETWORK SERVICE"
AGTPASSWORD=

ASACCOUNT=
ASPASSWORD=

RSACCOUNT=
RSPASSWORD=
;--------------------------------------------------------------------
; To use the *AUTOSTART features, specify 1 to start automatically or 0 to start manually.

See the bolded line, all you need to is specify the account for it and then launch setup.exe with the following parameters:
setup.exe /settings c:\template.ini

Looking at the command line, it seems likely that you could get away by copying and editing just the template.ini file instead of all the installation files to hard-disk.