It happens to almost all the windows users sometimes when you suddenly found your computer gets infected with viruses and Trojans which disables registry, task manager, command prompt, run prompt, greyed folder options and blocked system restore etc.
A user named tangomouse at raymond.cc forums created a simple free utility which re enables the disabled registry, task manager, command prompt, run prompt and all other restrictions applied by virus or spyware infection.
Here is how you can use this utility to fix everything which is disabled.
Re enable is a free to use program which will restore all the restrictions imposed due to virus, malware or trojan infection on your computer
You just need to click Enable and with this single click you will enable all the disabled components of windows