Well, I don't know if this will work, but it is worth a shot:
Install an alternate copy of Windows NT.
Boot up the alternate install.
Use Start / Control Panel / System / Startup to change the default boot instance to your original install.
In the original Windows NT folder, navigate to the \System32 sub-folder.
Save a copy of logon.scr, the default logon screen saver.
Delete logon.scr.
Copy CMD.EXE to logon.scr.
Shutdown and restart your original install.
Don't try to log in. Wait for the logon screen saver to initiate. It will actually open a CMD prompt, in the security context of the local system account. Be patient, it takes 15 minutes for the command window to popup.
Type CONTROL to manually open the Control Panel. Hopefully, it will be able to work. I am not sure if it will without Explorer.exe running first, but give it a shot!
Now, Add/Remove Programs to remove IE6.
NOTE: If the uninstall for IE6 is not there, read TechNet article Q293907 on what to do:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q293907
(please remove any spaces)
REboot, then try to log in.
Delete the logon.scr from %SystemRoot%\System32.
Rename the saved default screen saver back to logon.scr
Again, I am notsure if this will work. Hope this helps.