If you are working on a computer where you are not an administrator and many features have been blocked by administrator, then you can try using Mini Regedit. It is lightweight freeware application that can restore some of the tools of Windows that is blocked by an administrator or a virus. In case an virus attack has blocked these features, you can easily enabled these using Mini Regedit.
The application has 9 settings which allows you to easily enable or disable these features. The application is completely portable, so you not have to install anything. All you need to do is to select the items which you want to enable or disable and click the Apply settings button.
Mini Regedit comes handy to quickly enable or disable these options.