SQL Server Setup Failed To Modify Security Permissions

Last night at home on my 64 bit Vista machine, I encountered the same error 29506 that said that the management studio express could not be installed.  I looked up the error message and below is what I received.  I also installed the 64 bit .net framework which installed just fine before trying to install the SSSME.

I followed the instructions below but this did not seem to make a difference.  However, I did not reboot after applying new permissions.  I have installed this software a few times now on 32 bit machines for both XP and RC1 Vista, and have not had a problem.  Last night, I did use the 64 bit version.  Also, there is no data file yet because after the install it rolls back, so I gave myself Full permissions on the SQL server directory which should include all sub directories, right?  Thanks, Teri
Error 29506.
SQL Server Setup failed to modify security permissions on file Drive:Program FilesMicrosoft SQL ServerMSSQL.xMSSQLData for user SYSTEM. To proceed, verify that the account and domain running SQL Server Setup exist, that the account running SQL Server Setup has administrator privileges, and that exists on the destination drive.

Note A SQL Server service pack refers to SQL Server 2005 Service Pack 1 (SP1) and later service packs.
CAUSE
This problem occurs because one or more data files exist that do not have the required permissions. By default, the Full Control permission of the Administrators group is granted to the data file when you create a database. If the permission of this group is removed from the data file, the SQL Server 2005 service pack setup will fail.
RESOLUTION
To resolve this problem, grant the Full Control permission to the Administrators group on all data files and on the Data folder. To grant the Full Control permission to the data files, follow these steps:



1.
Locate the folder that contains the data files. By default, these files are located in the following folder:
C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLData

2.
Right-click the data file that has no required permissions for the Administrators group, and then click Properties.

3.
If the Administrators group is not in the Group or user names list, click Add, type Administrators, and then click OK.

4.
Click Administrators in the Group or user names list, and then click to select the Allow check box for the Full Control item in the Permissions for Administrators list.Note If the files in the Data folder have an orphan owner, you have to take ownership of the files and then grant the Full Control permission to the files. We recommend that you do not change the default permissions for the data files.