Enable Task Manager

Registry to enable (or disable) Task Manger (in Windows):

Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\System
Name: DisableTaskMgr
Type: REG_DWORD
Value: 1=Enablethis key, that is DISABLE TaskManager
Value: 0=Disablethis key, that is Don't Disable, Enable TaskManager

or

• Click Start
• Click Run
• Enter gpedit.msc in the Open box and click OK
• In the Group Policy settings window
  • Select User Configuration
  • Select Administrative Templates
  • Select System
  • Select Ctrl+Alt+Delete options
  • Select Remove Task Manager
  • Double-click the Remove Task Manager option
  • Since the policy is Remove Task Manager, by disabling the policy, you are enabling the Task Manager

Solution for Virus That Disable USB Slot

In simple way, this Trojan (Trojan.BAT.shutdown.bi) attack the system by disabling USB drive. So, usually when user attach their thumb drive, he/she unable to open the drive like it is not detected by the PC. This is one of the solution:

• Start PC in Safe Mode
• Control Panel > Folder Options > View
  • Show hidden files and folders
  • Don't tick:
    • Hide extensions for known files
    • Hide protected operating system files (Recommended)
  • OK
• Go to C:\Windows
• Find file photos.zip.exe
• Rename this file to photos.zip
• Rename again photo.zip to photos.doc
• Plug in any USB drive, double click into them and find file photos.zip and autorun.inf
• Delete both of this file (if exist)
• Restart your PC in normal mode
• Go to C:\Windows
• Delete photos.doc and pc-off.bat