I wonder if it might be possible to recreate the original profile \\RACHELELAPTOP\Users\Chris,
and assign the original password,
and grant full Administrator privileges,
and log into the profile to exterminate everything that was installed by that profile.
My daughter bought a Laptop XP with broadband.
My Desktop Win 95 only had a dial-up modem so she added me as a non-admin User for the benefit of broadband whilst the women in my life were talking on the phone and blocking my modem.
Much later I reached retirement and was given the job of I.T. Admin with Administrator privileges,
and she became a non-admin user because her interests were on-line shopping and other female pursuits.
Hang on - I am getting to the point
Later still the Firewall had to be updated, and it was NOT possible because the new installer could not remove an old registry key.
I then found that RegEdit could not delete the key either.
Eventually I found a way to beat RegEdit into submission.
It has since occurred to me that :-
The old registry key was created by the old version of the Firewall when running under my daughters Administration,
so she would have had full ownership when it was created, and she was still its owner when I was trying to delete it,
so perhaps the update installer would have succeeded had I re-instated my daughter as administrator and used her account to run the installer.
Perhaps Windows still remembers and preserves your ownership under the deleted profile of some item such as a file, folder, or registry key,
and will only permit removal of that item if you undelete/recreate that profile and assert your authority via that profile.