Most viruses when they infect a computer disable Task Manager, Registry Editor and Folder Option so that they could not be removed and you get a message like this when trying to access them:
Regain Power is an application that can enable these features back for you.
Regain Power is a simple application with a simple interface. If it finds a feature is disabled that item is not checked. To re-enable them just check the box and restart your computer.
In Windows 7/Vista you may need to run the application as an administrator.
Download: Regain Power [761.5 Kb]