Navidad:
Navidad Fix Tool

• Click on Start, Find, Files or Folders
  
• Search for REGEDIT.EXE
  
• Rename REGEDIT.EXE to REGEDIT.COM
  
• Run REGEDIT.COM
  
• In the right panel, search for and delete any of the registry key that contains WINSVRC.EXE and Navidad
  
• Make a note of the exact path to the virus, then close Regedit.
  
• Reboot your system
  
• Scan your system with an up-to-date virus scanner
  
• Rename REGEDIT.COM back to REGEDIT.EXE