Hello Brian,
Can you try this in a different browser instead of IE, if that doesn't help then try below steps.
Can you please go to the ColdFusion 10 installed directory "ColdFusion_root\cfsuion\bin\"
There is a batch file name "passwordreset.bat" just double click on it, that will launch a command prompt select the option 1 and then type your new password. Try again and let me know if that doesn't help.
Regards,
Anit Kumar