In the case of a disabled command prompt (cmd.exe), it will still run but will show a message “The command prompt has been disabled by your administrator. If the Task Manager is disabled, you will see an error popup that says “ Task Manager has been disabled by your administrator“. You can either access it by pressing Ctrl+Shift+Esc, right click on the Task bar and select Start Task Manager, or type taskmgr in the run box or search programs and files bar. The Windows Task Manager is one of the most useful tools to check for any unknown running process. One such virus that can cause the above mentioned problems is the Brontok virus, which will make some changes to the system restrictions in order to hide itself from easy detection and also from easy cleaning. There are some viruses that will go to the extent of disabling tools such as the Windows Task Manager, Registry Editor, Folder Options, Command Prompt and other functions built into Windows to prevent users from checking and fixing the problems. Some viruses are invisible which can only be detected by using special tools and undetected so that the computer can stay infected as long as possible. In the duration of staying undetected, the virus could have infected a lot of computers. New viruses are being made and released onto the Internet all the time and it’s possible for antivirus software to only start detecting it after a few days.
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