Start ur computer in safe mode with command prompt and type the followinf command to enable registry editor:-
HKCU\software\microsoft\windows\currentversion\policies\system /v "DisableRegistryTools"
HKLM\software\microsoft\windows\currentversion\policies\system /v "DisableRegistryTools"
after this ur registry editor is enable
to run and type regedit
then follow the following path :-
on the right side delete the entries which contain 'Brontok' and 'Tok-' words.
after that restart ur system
open registry editor and follow the path to enable folder option in tools menu
delete this entry and restart ur computer
and search *.exe files in all drives (search in hidden files also)remove all files which are display likes as folder icon.
ur computer is completely free from virus brontok