Before this, I use Nod32 antivirus (now I’m using Kaspersky 7) to protect my PC from viruses. Although Nod32 is good but my PC was once got infected by a virus and it had remove my Folder Options from the menu. Other than that, it also had disabled my Task Manager.
I thought I can get the Folder Options and the Task Manager back by using Regedit, but this virus is way too smart and it also disabled the Regedit. There is nothing I can do and lastly I format my PC.