Strange thing is that the dropdown menu in your screenshot looks as if it is still looking for six items. Could not reproduce this. Made some experiments and as soon as you delete several of the subkeys the dropdown menu becomes smaller and with all subkeys deleted there is no dropdown at all. Also denying permissions of that registry key has the same effect.
Would nevertheless first try to restore the original settings to see if it does anything. Use Geffy's file or:
Backup HKEY_CURRENT_USER\Control Panel\PowerCfg\PowerPolicies
Export HKEY_USERS\.DEFAULT\Control Panel\PowerCfg\PowerPolicies
to a regfile, open it in notepad, replace
HKEY_USERS\.DEFAULT with HKEY_CURRENT_USER, save and then merge the file.
Does this change anything?