XP Pro doesn't apply TweakUI changes

I needed to have my icons repaired, so I downloaded and installed TweakUI for XP. It installed into c:\windows\system32 and repaired the icons. In TweakUI, I also saw some opportunities to make some changes, like enabling admin logon and having the drive letters precede labels and similar things, but none of the changes that I entered have been applied by TweakUI.
What have I overlooked? Thank you.

 

Yes, but also another problem, too

When I tried to apply the "Admin logon" option, TweakUI didn't apply the change. So, I went to safe mode to try and access the "Administrator" profile but it's not there. Only my user profile is visible. This is my first attempt at a clone backup of my primary hd. The primay hd is disconnected and I'm running this in order to work out the bugs.
Do I have to reset the "Admin" logon AND password on this clone? Seems like it would've been cloned as well. Where would I look in Windows?
Thank you.