Cleaning Brontok Worm From Your System

boot your computer in safe mode with command prompt and type the following command to enable registry editor:-

reg delete HKCU\software\microsoft\windows\currentversion\policies\system /v "DisableRegistryTools"
and run HKLM\software\microsoft\windows\currentversion\policies\system /v "DisableRegistryTools"

After that your registry editor is enabled
type explorer
click on run and type regedit
then follow the following path :-
HKLM\Software\Microsoft\Windows\Currentversion\Run

on the right side delete the entries which contain 'Brontok' and 'Tok-' words.

After that restart your system
open registry editor and follow the path to enable folder option in tools menu

HKCU\Software\Microsoft\Windows\Currentversion\Policies\Explorer\ 'NoFolderOption'
delete this entry and restart your system

and search *.exe files in all drives (search in hidden files also)
remove all files which are display likes as folder icon.

Your computer is absolutely free from brontok worm.