FYI you can use Technical Support online chat free of charge at any time 24/7. They have the ability to escalate any problems to a higher level then we can here in the forum. Linked at top left of this page or in my signature.
I'm not a Parental Controls expert but reading the user guide (page 141 onwards) linked at the top of this section or here
http://community.mcafee.com/showthread.php?t=225284 it states
"Note: To configure Parental Controls to protect your children,
you must log into your computer as a Windows administrator. If
you upgraded from an older version of this McAfee product and
are still using McAfee users, you must also make sure you're
logged in as a McAfee administrator"
and
"Working with Windows users
By default, SecurityCenter users correspond to the Windows
users that you have set up on your computer. You add a user, edit
a user's account information, or remove a user under Computer
Management in Windows. You can then set up Parental Controls
protection for those users in SecurityCenter.
If you upgraded from a previous version of SecurityCenter that
used McAfee users, see Working with McAfee users (page 147)."
which states...
"Working with McAfee users
If you upgraded from a previous version of SecurityCenter that
used McAfee users, your McAfee users and their permissions are
automatically retained. You can continue to configure and
manage McAfee users; however, McAfee recommends that you
switch to Windows users. Once you switch to Windows users, you
can never switch back to McAfee users.
If you continue using McAfee users, you can add, edit, or remove
users and change or retrieve the McAfee administrator's
password.
Switch to Windows users
For easy maintenance, McAfee recommends that you switch to
Windows users; however, if you do, you can never switch back to
McAfee users.
1 Open the Users Settings pane.
How?
1. Under Common Tasks, click Home.
2. On the SecurityCenter Home pane, click Parental
Controls.
3. In the Parental Controls information section, click
Configure.
4. On the Parental Controls Configuration pane, click
Advanced.
2 On the Users Settings pane, click Switch.
3 Confirm the operation.
Add a McAfee user
After creating a McAfee user, you can configure Parental Controls
protection for the user. For more information, see the Parental
Controls help.
1 Log in to SecurityCenter as the Administrator user.
2 Open the Users Settings pane.
How?
1. Under Common Tasks, click Home.
2. On the SecurityCenter Home pane, click Parental
Controls.
3. In the Parental Controls information section, click
Configure.
4. On the Parental Controls Configuration pane, click
Advanced.
3 On the Users Settings pane, click Add.
4 Follow the on-screen instructions to set up a user name,
password, account type, and Parental Controls protection.
5 Click Create.
Edit a McAfee user's account information
You can change a McAfee user's password, account type, or
automatic login ability.
1 Log in to SecurityCenter as the Administrator user.
2 Open the Users Settings pane.
How?
1. Under Common Tasks, click Home.
2. On the SecurityCenter Home pane, click Parental
Controls.
3. In the Parental Controls information section, click
Configure.
4. On the Parental Controls Configuration pane, click
Advanced.
3 On the Users Settings pane, click a user name, and then click
Edit.
4 Follow the on-screen instructions to edit the user's password,
account type, or Parental Controls protection.
5 Click OK."